Bring back the old-style Ring/Vibrate/Silent states when using volume keys.

In order to completely mute the ringer (no vibrate), introduce an extra
state beyond mute, which mutes the vibrator as well, if it was enabled.

Bug: 5530217

Change-Id: Ib1f299ee6bbca56c1aa7e1100662591362d08307
9 files changed