Add support for STM32L0/L1 onboard EEPROM. (#8002)

* Add support for STM32L0/L1 onboard EEPROM.

* Update docs/eeprom_driver.md

Co-Authored-By: Joel Challis <[email protected]>

Co-authored-by: Joel Challis <[email protected]>

common_features.mk

@@ -141,6 +141,10 @@ else
         SRC += $(PLATFORM_COMMON_DIR)/flash_stm32.c
         OPT_DEFS += -DEEPROM_EMU_STM32F072xB
         OPT_DEFS += -DSTM32_EEPROM_ENABLE
+      else ifneq ($(filter $(MCU_SERIES),STM32L0xx STM32L1xx),)
+        OPT_DEFS += -DEEPROM_DRIVER
+        COMMON_VPATH += $(DRIVER_PATH)/eeprom
+        SRC += eeprom_driver.c eeprom_stm32_L0_L1.c
       else
         # This will effectively work the same as "transient" if not supported by the chip
         SRC += $(PLATFORM_COMMON_DIR)/eeprom_teensy.c