uncrypt: Write status when it reboots to factory reset

When it reboots into recovery for a factory reset, it still needs to
write the uncrypt status (-1) to the pipe.

Bug: 21511893
(cherry picked from commit 2c2cae8a4a18b85043bb6260a59ac7d1589016bf)
Change-Id: Ia5a75c5edf3afbd916153da1b4de4db2f00d0209
1 file changed