Sensor: Enable the motion accelerometer for screen orientation change
The screen orientation can be detected by the motion accelerometer
instead of generic accelerometer to save power.

Change-Id: Iaeb3e5958d2ef7cc33080d7091ed8a5462695c67
SystemUI: Add global reboot option

Add global reboot option when long press power key and confirmation dialog
when user chooses to reboot device.

Change-Id: I23286cb655a4fead8dfc450f08f27d9588e47686