fix double ringer volume slider

On voice capable devices (phones) ringer and notification volume
is linked. Don't show the second slider until we can break the link.

Change-Id: I7161f88f048234e5ca1050d4ad87224476e37a1a
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Less notifications sound (1/2)

Add back the 4.3 feature like it was.
User can setup how often notification sounds
for an app comes through so that
it does not annoy them so much.

Change-Id: I3d7b2ef2e2ff99b7c23880626e0268ec4c5d8543