Send mute state to UI.

Append to API to support deliver of mute status.
Have PhoneUtils.setMuteInternal notify the AudioRouter of the change.
AudioRouter then notifies CallHandlerServiceProxy.

Removed unused "previousstate" from the AudioRouter listener method;
replaced it with muted state.

bug:10395427
Change-Id: I0295e9d6b9af981c4911f2f5ba3abd65b748fd6e
4 files changed