Support for Debug Codes - Dnnn (#19225)

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

Marlin/src/HAL/STM32/HAL.h

@@ -134,6 +134,8 @@ void HAL_clear_reset_source();
 // Reset reason
 uint8_t HAL_get_reset_source();
 
+inline void HAL_reboot() {}  // reboot the board or restart the bootloader
+
 void _delay_ms(const int delay);
 
 extern "C" char* _sbrk(int incr);