eeprom_init from STM32F1/access_start

Marlin/src/HAL/STM32F1/eeprom_wired.cpp

 bool PersistentStore::access_finish() { return true; }
 
 bool PersistentStore::access_start() {
+  eeprom_init();
   #if ENABLED(SPI_EEPROM)
     #if SPI_CHAN_EEPROM1 == 1
       SET_OUTPUT(BOARD_SPI1_SCK_PIN);