Settings: Add Advanced reboot (1 of 2)

AOSP Porting

This commit adds a setting in Development settings for including options
in the power menu for rebooting into recovery or bootloader, defauled to
off.

When enabled, the Advanced reboot options will only be available once the
device is unlocked.

Change-Id: Ib77f0be178d15131b99adbe0abb6ba18b2b7c0b6

Conflicts:
	res/values/cm_strings.xml
	res/values/strings.xml
	res/xml/development_prefs.xml
	src/com/android/settings/DevelopmentSettings.java