Enable use of SERIAL_PORT_2 on HAL_STM32 (#12197)

Marlin/src/HAL/HAL_STM32/HAL.cpp

 
 #include "HAL.h"
 
+#include "../../inc/MarlinConfig.h"
+
 #if ENABLED(EEPROM_EMULATED_WITH_SRAM)
   #if STM32F7xx
     #include "stm32f7xx_ll_pwr.h"

Marlin/src/HAL/HAL_STM32/HAL.h

   #include <USBSerial.h>
 #endif
 
+#include "../../inc/MarlinConfigPre.h"
 #include "../shared/math_32bit.h"
 #include "../shared/HAL_SPI.h"
 #include "fastio_STM32.h"

Marlin/src/HAL/HAL_STM32/watchdog_STM32.h

  */
 #pragma once
 
-#include "../../inc/MarlinConfig.h"
-
 void watchdog_init();
 void watchdog_reset();