PowerManagerService: Hold a wakelock while mProximityTask is queued

This prevents the device from sleeping while a deferred proximity sensor
event is pending.
Fixes b/2260005 (Proximity sensor can fail due to missing wakelock)

Change-Id: Ia4825f548b5b7d8a0b184f720b32c2f21b77b96e
Signed-off-by: Mike Lockwood <lockwood@android.com>
1 file changed