Themes: Update LoadedApk resources.

Instead of creating a new LoadedApk when resources are not up to
date, we use the existing LoadedApk but recreate mResources.

Change-Id: Ic1ad810863d03c2cedc751c9e84dd7c954daf3d7
Merge "Themes: Update LoadedApk resources." into cm-11.0
Merge remote-tracking branch 'CM/cm-11.0' into cm-11.0