Add Power Widget

This commit adds the Power widget for phones.  All toggles should work
except for LTE (disabled for now)

Change-Id: I17669420d9db9a347af182fc398c6426e18534f4

PowerWidget: Make widgets stationary like everything else in the tray

Before patch: widgets move up with the grab bar (and get smashed a bit)
https://dl.dropbox.com/u/1077120/Android/Screenshot_2012-09-13-18-19-39.png

After patch: widgets disappear behind the grab bar, like everything else
https://dl.dropbox.com/u/1077120/Android/Screenshot_2012-09-13-18-23-52.png

Change-Id: Iedded9c4ba89bb5284a8b8cd0e48be8e0cafa01d

Conflicts:

	core/java/android/provider/Settings.java
	core/res/res/values/public.xml