Update sound settings icons

In several places we were referencing private icons from
frameworks/base/core instead of versions we already had in
settings. Also add in a "media stream off" icon to match the one we
already had for "media stream on".

Bug: 77982107
Test: manual (Settings->Sound, then use hardware controls to modify
media and ring volumes)

Change-Id: I3a1d808b3028bb4f2feae4536194dc58c3177a66