General cleanups for HAL

Marlin/src/HAL/HAL_TEENSY35_36/HAL_Servo_Teensy.h

@@ -1,5 +1,5 @@
-#ifndef HAL_Servo_Teensy_h
-#define HAL_Servo_Teensy_h
+#ifndef _HAL_SERVO_TEENSY_H_
+#define _HAL_SERVO_TEENSY_H_
 
 #include <Servo.h>
 
@@ -15,4 +15,4 @@ class libServo : public Servo {
      uint8_t servoIndex;               // index into the channel data for this servo
 };
 
-#endif // HAL_Servo_Teensy_h
+#endif // _HAL_SERVO_TEENSY_H_