Rename, clean up boards/variants (#21655)

* Consolidate variant scripts
* Rename Marlin-local boards
* Simplify variants where possible
* Rename variants
* CHITU_F103 and MEEB_3DP: Maple platform `platformio-build-stm32f1.py` uses the 'board' name, not 'board_build.variant' so folder names match 'board' and not `board_build.variant`.

buildroot/share/PlatformIO/boards/LERDGE.json

@@ -1,65 +0,0 @@
-{
-  "build": {
-    "core": "stm32",
-    "cpu": "cortex-m4",
-    "extra_flags": "-DSTM32F407xx",
-    "f_cpu": "168000000L",
-    "hwids": [
-      [
-        "0x1EAF",
-        "0x0003"
-      ],
-      [
-        "0x0483",
-        "0x3748"
-      ]
-    ],
-    "mcu": "stm32f407zgt6",
-    "variant": "LERDGE",
-    "ldscript": "LERDGE.ld"
-  },
-  "debug": {
-    "jlink_device": "STM32F407ZG",
-    "openocd_target": "stm32f4x",
-    "svd_path": "STM32F40x.svd",
-    "tools": {
-      "stlink": {
-        "server": {
-          "arguments": [
-            "-f",
-            "scripts/interface/stlink.cfg",
-            "-c",
-            "transport select hla_swd",
-            "-f",
-            "scripts/target/stm32f4x.cfg",
-            "-c",
-            "reset_config none"
-          ],
-          "executable": "bin/openocd",
-          "package": "tool-openocd"
-        }
-      }
-    }
-  },
-  "frameworks": [
-    "arduino",
-    "stm32cube"
-  ],
-  "name": "STM32F407ZGT6(192k RAM. 1024k Flash)",
-  "upload": {
-    "disable_flushing": false,
-    "maximum_ram_size": 196608,
-    "maximum_size": 1048576,
-    "protocol": "stlink",
-    "protocols": [
-      "stlink",
-      "dfu",
-      "jlink"
-    ],
-    "require_upload_port": true,
-    "use_1200bps_touch": false,
-    "wait_for_upload_port": false
-  },
-  "url": "https://www.st.com/en/microcontrollers-microprocessors/stm32f407ZG.html",
-  "vendor": "Generic"
-}

buildroot/share/PlatformIO/boards/fysetc_f6.json

@@ -1,34 +0,0 @@
-{
-  "build": {
-    "core": "arduino",
-    "extra_flags": "-DARDUINO_AVR_MEGA2560",
-    "f_cpu": "16000000L",
-    "hwids": [
-      [
-        "0x27b2",
-        "0x0002"
-      ]
-    ],
-    "mcu": "atmega2560",
-    "variant": "fysetcf6"
-  },
-  "debug": {
-    "simavr_target": "atmega2560",
-    "avr-stub": {
-      "speed": 115200
-    }
-  },
-  "frameworks": [
-    "arduino"
-  ],
-  "name": "FYSETC F6",
-  "upload": {
-    "maximum_ram_size": 8192,
-    "maximum_size": 258048,
-    "protocol": "wiring",
-    "require_upload_port": true,
-    "speed": 115200
-  },
-  "url": "https://www.fysetc.com/",
-  "vendor": "FYSETC"
-}

buildroot/share/PlatformIO/boards/marlin_BTT_SKR_SE_BX.json

@@ -5,7 +5,7 @@
     "extra_flags": "-DSTM32H743xx",
     "f_cpu": "400000000L",
     "mcu": "stm32h743iit6",
-    "variant": "BTT_SKR_SE_BX"
+    "variant": "MARLIN_BTT_SKR_SE_BX"
   },
   "debug": {
     "jlink_device": "STM32H743II",

buildroot/share/PlatformIO/boards/marlin_BigTree_BTT002.json

@@ -15,7 +15,7 @@
       ]
     ],
     "mcu": "stm32f407vgt6",
-    "variant": "BIGTREE_BTT002"
+    "variant": "MARLIN_BIGTREE_BTT002"
   },
   "debug": {
     "jlink_device": "STM32F407VG",

buildroot/share/PlatformIO/boards/marlin_BigTree_GTR_v1.json

@@ -15,7 +15,7 @@
       ]
     ],
     "mcu": "stm32f407zgt6",
-    "variant": "BIGTREE_GTR_V1"
+    "variant": "MARLIN_BIGTREE_GTR_V1"
   },
   "debug": {
     "jlink_device": "STM32F407ZG",

buildroot/share/PlatformIO/boards/marlin_BigTree_SKR_Pro.json

@@ -15,7 +15,7 @@
       ]
     ],
     "mcu": "stm32f407zgt6",
-    "variant": "BIGTREE_SKR_PRO_1v1"
+    "variant": "MARLIN_BIGTREE_SKR_PRO_11"
   },
   "debug": {
     "jlink_device": "STM32F407ZG",

buildroot/share/PlatformIO/boards/marlin_CHITU_F103.json

@@ -15,8 +15,7 @@
       ]
     ],
     "mcu": "stm32f103zet6",
-    "variant": "CHITU_F103",
-    "ldscript": "chitu_f103.ld"
+    "variant": "marlin_CHITU_F103"
   },
   "debug": {
     "jlink_device": "STM32F103ZE",

buildroot/share/PlatformIO/boards/marlin_FYSETC_CHEETAH_V20.json

@@ -16,7 +16,7 @@
     ],
     "ldscript": "stm32f401rc.ld",
     "mcu": "stm32f401rct6",
-    "variant": "FYSETC_CHEETAH_V20"
+    "variant": "MARLIN_FYSETC_CHEETAH_V20"
   },
   "debug": {
     "jlink_device": "STM32F401RC",

buildroot/share/PlatformIO/boards/marlin_MEEB_3DP.json

@@ -18,7 +18,7 @@
       "ldscript": "stm32f103xc.ld"
     },
     "mcu": "stm32f103rct6",
-    "variant": "MEEB_3DP"
+    "variant": "marlin_MEEB_3DP"
   },
   "debug": {
     "jlink_device": "STM32F103RC",

buildroot/share/PlatformIO/boards/marlin_STEVAL_STM32F401VE.json

@@ -14,9 +14,8 @@
         "0x3748"
       ]
     ],
-    "ldscript": "stm32f401xe.ld",
     "mcu": "stm32f401vet6",
-    "variant": "STEVAL_F401VE"
+    "variant": "MARLIN_STEVAL_F401VE"
   },
   "debug": {
     "jlink_device": "STM32F401VE",

buildroot/share/PlatformIO/boards/marlin_STM32F407ZGT6.json

@@ -14,8 +14,7 @@
         "0x3748"
       ]
     ],
-    "mcu": "stm32f407zgt6",
-    "variant": "FLY_F407ZG"
+    "mcu": "stm32f407zgt6"
   },
   "debug": {
     "jlink_device": "STM32F407ZG",
@@ -49,7 +48,7 @@
     "disable_flushing": false,
     "maximum_ram_size": 196608,
     "maximum_size": 1048576,
-    "protocol": "dfu",
+    "protocol": "stlink",
     "protocols": [
       "stlink",
       "dfu",

buildroot/share/PlatformIO/boards/marlin_archim.json

@@ -21,7 +21,7 @@
     "ldscript": "linker_scripts/gcc/flash.ld",
     "mcu": "at91sam3x8e",
     "usb_product": "Archim",
-    "variant": "archim"
+    "variant": "MARLIN_ARCHIM"
   },
   "connectivity": [
     "can"