OmniTorch for Nexus 5 (hammerhead)

Refs from CM

Patchset 3: - add some more information to the overlay
            - put the call in device.mk back to where it was originally
Patchset 4: fix spacing
Patchset 5: Change permission of sysfs parameter

Change-Id: I07f6be272d57d228f2ca32804cf52c4e770e7abd
Merge "OmniTorch for Nexus 5 (hammerhead)" into android-4.4