Reorganize HAL (#14832)

Marlin/src/HAL/HAL_TEENSY35_36/HAL.h

@@ -31,10 +31,10 @@
 #include "../shared/math_32bit.h"
 #include "../shared/HAL_SPI.h"
 
-#include "fastio_Teensy.h"
-#include "watchdog_Teensy.h"
+#include "fastio.h"
+#include "watchdog.h"
 
-#include "HAL_timers_Teensy.h"
+#include "timers.h"
 
 #include <stdint.h>
 #include <util/atomic.h>

Marlin/src/HAL/HAL_TEENSY35_36/Servo.cpp

@@ -4,7 +4,7 @@
 
 #if HAS_SERVOS
 
-#include "HAL_Servo_Teensy.h"
+#include "Servo.h"
 
 uint8_t servoPin[MAX_SERVOS] = { 0 };
 

Marlin/src/HAL/HAL_TEENSY35_36/timers.cpp

@@ -28,7 +28,7 @@
 #if defined(__MK64FX512__) || defined(__MK66FX1M0__)
 
 #include "HAL.h"
-#include "HAL_timers_Teensy.h"
+#include "timers.h"
 
 /** \brief Instruction Synchronization Barrier
   Instruction Synchronization Barrier flushes the pipeline in the processor,

Marlin/src/HAL/HAL_TEENSY35_36/watchdog.cpp

@@ -26,7 +26,7 @@
 
 #if ENABLED(USE_WATCHDOG)
 
-#include "watchdog_Teensy.h"
+#include "watchdog.h"
 
 void watchdog_init() {
   WDOG_TOVALH = 0;