AS: send the mute event to APM

When sending the volume to APM we do not send 0 when the stream is
muted. Instead we send the actual index together with the muted state

Flag: com.android.media.audio.ring_my_car
Test: dumpsys + logs
Bug: 319515324
Change-Id: I00843bda6591f15997b9ac262235422edb8c3907
10 files changed