Add JGAurora A5S and A1 (STM32F103ZET6) (#14291)

- Now compiles and works correctly with changes to HAL timers and watchdog.
- Does NOT include awesome work on touch screen function.
- Does have working LCD and SD-based EEPROM.

buildroot/share/PlatformIO/ldscripts/jgaurora_a5s_a1.ld

@@ -0,0 +1,14 @@
+MEMORY
+{
+  ram (rwx) : ORIGIN = 0x20000C00, LENGTH = 64K - 3K
+  rom (rx)  : ORIGIN = 0x0800A000, LENGTH = 512K - 40K
+}
+
+/* Provide memory region aliases for common.inc */
+REGION_ALIAS("REGION_TEXT", rom);
+REGION_ALIAS("REGION_DATA", ram);
+REGION_ALIAS("REGION_BSS", ram);
+REGION_ALIAS("REGION_RODATA", rom);
+
+/* Let common.inc handle the real work. */
+INCLUDE common.inc