Perform data wipe in recovery if ota package has powerwash set

Normally, if an ota package has --wipe_user_data flag, we set bootloader
parameter --wipe_data, so that next boot into bootloader will wipe
userdata. But this doesn't work in recovery, likely because after
recovery we don't reboot to bootloader, but directly boot into android.
Therefore perform data reset in recovery if the OTA package has
POWERWASH flag.

Bug: 203507329
Test: apply an OTA pkg with --wipe_user_data, verify that data wipe
happened

Change-Id: Icca4a5f74246bde44a5fd589395404c9f57867ee