Add another control mechanism to flash device

Some samsung boards have another control mechanism

Change-Id: Ia72bae1aba36ad190116a22be6c0048740098681
Add wakelock for mUseSamsungLedDevice

Change-Id: Id1bce33b94fa4541d5967258f7d08f65c5a57929
Merge pull request #1 from arco/cm-11.0