Merge pull request #7770 from thinkyhead/bf2_HAL_cleanups_etc

Marlin/src/HAL/HAL_AVR/HAL_AVR.cpp

Marlin/src/HAL/HAL_AVR/HAL_AVR.h

Marlin/src/HAL/HAL_AVR/HAL_spi_AVR.cpp

Marlin/src/HAL/HAL_AVR/pinsDebug_AVR_8_bit.h

Marlin/src/HAL/HAL_DUE/HAL_Due.cpp

Marlin/src/HAL/HAL_DUE/HAL_Due.h

Marlin/src/HAL/HAL_DUE/HAL_spi_Due.cpp

Marlin/src/HAL/HAL_DUE/watchdog_Due.cpp

Marlin/src/HAL/HAL_LPC1768/HAL.cpp

Marlin/src/HAL/HAL_LPC1768/HAL.h

Marlin/src/HAL/HAL_LPC1768/HardwareSerial.cpp

Marlin/src/HAL/HAL_LPC1768/HardwareSerial.h

Marlin/src/HAL/HAL_LPC1768/LPC1768_PWM.h

Marlin/src/HAL/HAL_LPC1768/LPC1768_Servo.cpp

Marlin/src/HAL/HAL_LPC1768/LPC1768_Servo.h

Marlin/src/HAL/HAL_LPC1768/SoftwareSerial.cpp

Marlin/src/HAL/HAL_LPC1768/arduino.cpp

Marlin/src/HAL/HAL_LPC1768/include/arduino.h

Marlin/src/HAL/HAL_SanityCheck.h

Marlin/src/HAL/HAL_TEENSY35_36/HAL_Servo_Teensy.cpp