Forward Port: Volume button seek on screen off [2/2]

Change-Id: I788fc4cfbb688d99de241991821ebf7e277d19ad
Signed-off-by: cj360 <ayunker551@gmail.com>

Conflicts:
	res/values/slim_strings.xml
	res/xml/slim_sound_settings.xml
	src/com/android/settings/slim/SoundSettings.java