inputflinger: Add gesture sensor support

Change-Id: Ieca4e54439c47a817aaa6a9b6fabcee750ffc0c2
Add GESTURE_SENSOR input source

Change-Id: If61a7e7bf2d8b2665db7ca57ed68a4462d0c1783
Merge remote-tracking branch 'upstream/cm-12.0' into cm-12.0