[feature] Add Option Byte Support for STM32WLEx

[AlexKlimaj]

The STM32WLEx currently doesn't support writing option bytes. The STM32WLEx from Seedstudio comes with read out protection turned on and needs to be disabled to flash the chip.

Update: It should work for reading but its using the wrong option_base in the config. Even after changing it to 0x1fff7800 and rebuilding, it still tries to read from 0x1fffc000. After hard coding 0x1fff7800 in common.c, I can read. But write is not implemented.