Revert "status bar: native battery percentage"

This reverts commit 20ea02194db4c7a6e4545a3793796f98ae3c80d3.

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