Revert FLASH_EEPROM_EMULATION include

Marlin/src/HAL/STM32/eeprom_flash.cpp

 #if ENABLED(FLASH_EEPROM_EMULATION)
 
 #include "../shared/eeprom_api.h"
-#include "utility/stm32_eeprom.h"
+
+// Better: "utility/stm32_eeprom.h", but only after updating stm32duino to 2.0.0
+// Use EEPROM.h for compatibility, for now.
+#include <EEPROM.h>
 
 /**
  * The STM32 HAL supports chips that deal with "pages" and some with "sectors" and some that