fastboot: Add oem command to wipe Titan M userdata

Because fastbootd just wipe Android userdata partition when
user input "fastboot erase userdata" command.

We add a new oem command for fastbootd to notify Titan M to
wipe userdata after Android userdata has been erased.

Bug: 150929955
Change-Id: Ife9d49580c35c184ac2feecb70844785b42a0591
3 files changed