PowerManager: Don't wake up device when charger is plugged/unplugged …
…(2/2)

This will add the option to disable waking up the device when a charger
is plugged or unplugged.

Patchset 2
- cleanup old code

Change-Id: Iceb685746c4a5a7ea7e393d45d537316db366669

Conflicts:

	res/xml/display_settings.xml
	src/com/android/settings/DisplaySettings.java