Support for Debug Codes - Dnnn (#19225)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/HAL/SAMD51/HAL.h

@@ -88,6 +88,8 @@ typedef int8_t pin_t;
 void HAL_clear_reset_source();  // clear reset reason
 uint8_t HAL_get_reset_source(); // get reset reason
 
+inline void HAL_reboot() {}  // reboot the board or restart the bootloader
+
 //
 // ADC
 //