db845c: flash-all-aosp.sh: Format metadata when flashing

YongQin ran into an issue where adb remount was failing
because his metadata partition was old. So lets avoid
having others hit this by formatting metadata when doing
a flashall.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I6167c45b04d73fff2b9c68181906965cf4b7d462
1 file changed