Settings: Add Advanced reboot [2/2]

This commit responds to a setting in Development settings for including
options in the power menu for rebooting into recovery and bootloader.

It has three settings:
- Disabled [Default]
- Enable when unlocked
- Always show

Enhanced by : kufikugel

PS 4 : Cleanup and move to security

Change-Id: I59690daf92514dff10543171bb3eba435fa216e5
Merge "Settings: Add Advanced reboot [2/2]" into kk4.4