Add board definitions for M5Station

The link to this development version is here. M5Station-485 M5Station-BAT

Hi @Tinyu-Zhao , thanks for the PR! There is no such variant m5stack_station in the official Arduino core for ESP32 https://github.com/espressif/arduino-esp32/tree/master/variants. Please add this board there in the first place.

OK, I have added the relevant documents and are waiting for the review of espressif, Thank you.

Hello, at the moment espressif has merged the request, please help with this.https://github.com/espressif/arduino-esp32/pull/7101

Thanks, merged!