Revert "status bar: native battery percentage"

This reverts commit 5077f5105d2ca451c7eec0e76c5c4e3274a1c01e.
status bar: battery level text

1. Add TextView to display battery level percentage next to the battery icon.
2. Remove support for displaying battery percentage on the actual battery icon itself.
3. Also respect view on lockscreen and opened notification drawer.

Conflicts:
	core/java/android/provider/Settings.java