Extend the audio HAL interface to support get/set master mute: DO NOT MERGE

Extend the audio HAL interface to allow HALs to optionally support HW
level master mute.  This follows the same pattern as master volume and
is part of the fix for bug 6828363.  Because of the divergences
between ICS and master, this change will need to be merged by hand.

Signed-off-by: John Grossman <johngro@google.com>
Change-Id: Ica6f5e37e13d13dde60463966f41f271ffa104fd
2 files changed