GEL Integration (1/3)

Changed INJECT_EVENTS permission from signature to signatureOrSystem.

Change-Id: Ie3633aa2ee7a2f22b7f32232ce4d3d98f33fd39d
Merge "GEL Integration (1/3)" into cm-11.0
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_frameworks_base into android-4.4