Implement powerwash on Android.
Powerwash, the name for the equivalent of a factory reset or /data wipe,
can be triggered in Android by writing the desired command to the
recovery command file and rebooting into recovery.
This patch moves the powerwash scheduling/canceling logic to the
HardwareInterface and implements it on Android.
Bug: 28700985
TEST=Called update_engine_client passing POWERWASH=1, BCB is stored up
to offset 832.
(cherry picked from commit fb905d9b8d49f8fe41297c7aba2dd0942f1be311)
Change-Id: I66f9473c10fbe8f56e9000ce3e605b2bee345db8
20 files changed