Remove reboot to Bootloader from menu.

We only need reboot to recovery. Rebooting to bootloader is meaningless
for us.
This also eliminated the camera from the lockscreen. Not absolutely
necessary now (can be done through settings).

Change-Id: Ie4b5cdbbe4922fdefdc1ff1462825b3b08100063
Merge remote-tracking branch 'upstream/cm-10.2' into cm-10.2