Allow ADB to be enabled by default via a config overlay

This is useful for developers that are testing and troubleshooting boot issues
and adb ends up being disabled by default once the system kicks in.  This should
only be used for testing and removed once a device is deemed stable and able to
boot.

Change-Id: Ib17d4e10ec68640ce55a91d5b1067d3d37eeec9d
Reboot Recovery & Reboot Bootloader in Power Menu

Coded fram scratch by me (yashade2001). It's not a port from CM11 or other KK ROMs. Not hardcoded, used IPowerManager.

Drawables by MrBaNkS.

Change-Id: I9138a3b9b7ef5ba96806bf5e388f36a267530ca3

Conflicts:
	core/res/res/values/strings.xml
	policy/src/com/android/internal/policy/impl/GlobalActions.java