chore(wb0): add EEPROM support

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

libraries/EEPROM/src/utility/stm32_eeprom.c

@@ -265,9 +265,10 @@ void eeprom_buffer_flush(void)
   EraseInitStruct.PageAddress = FLASH_BASE_ADDRESS;
 #endif
   EraseInitStruct.NbPages = 1;
-#if !defined(PROT_LEVEL_NONE)
+#if !defined(PROT_LEVEL_NONE) && !defined(STM32WL3x)
   if (HAL_FLASH_Unlock() == HAL_OK)
-#endif
+/* TODO: else HAL_FLASHEx_PageProtection? */
+  #endif
   {
     __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);
     if (HAL_FLASHEx_Erase(&EraseInitStruct, &pageError) == HAL_OK) {
@@ -303,9 +304,9 @@ void eeprom_buffer_flush(void)
         }
       }
     }
-#if !defined(PROT_LEVEL_NONE)
+#if !defined(PROT_LEVEL_NONE) && !defined(STM32WL3x)
     HAL_FLASH_Lock();
-#endif /* FLASH_KEY1 || FLASH_PEKEY1 */
+#endif
   }
 #else /* FLASH_TYPEERASE_SECTORS */
   uint32_t SectorError = 0;