add stm32g070-st-nucleo bsp#3732

Merged

BernardXiong merged 3 commits intoRT-Thread:masterfrom

NU-LL:stm32g070-st-nucleo

Jul 8, 2020

Commits on Jul 1, 2020

Commits on Jul 7, 2020

Fix format issues
NU-LL
committed