Change-Id: I6009b3c1950ba32b7f1e205a3db2307fe0cd688e

bug: 6129704

Change-Id: Ib63f1ed2d610e27e14957cf8805ef884cae6adf6

It's probably simpler not to have registers dance around,
and just message the feedback manager when the audio event
happens.

Change-Id: Id0710ed102d10d01f1af93ad8cb660653bb3a9f8

It's rather annoying (and possibly dangerous) to keep this as a member.
Get it from outside.

Change-Id: I00c42db96395fb65204fb140aeedc82bf312a86e

Change-Id: Ibaaeb8dbcb012f5e973e27ed9928401515656e9e

Change-Id: I0c6e207bae1e08c45a95b3479e1d67228d696792

mSoundOn is much easier to understand than mSilentModeOn

Change-Id: Ie51c5c75fcad62e13e0fb578a266af80f15dc440

There is little point in deferring loading for this. Getting the
service at startup time is not very expensive anyway, plus we
can avoid getting it in a later change if sound is off in settings.

Change-Id: I08d65467f245fa2f9f617eb23257c327b3115673

Change-Id: I957d883d1ccf188cb98eb11031aa0a32fce4ed76