[Add Tools][RootFs][Flash]

2020.09.01 / Folus Wen

Actions:
1. EVSE/rootfs/bin/flash_erase add flash erase tools.
2. EVSE/rootfs/bin/nandtest add flash test tools.

Files:
1. As follow commit history

Image version: D0.00.XX.XXXX.XX
Image checksum: XXXXXXXX

Hardware PWB P/N : XXXXXXX
Hardware Version : XXXXXXX