Playback resume after call

Under normal circumstances music is paused automatically when placing a
call, when there are multiple phones involved it is sometimes necessary
to pause the music on phones not making a call.  When audio is resumed
there needs to be sufficient time for all devices to register that the
call has ended before music can resume.

Bug: 73133707
Test: runtest bluetooth -p com.android.bluetooth.hfpclient and manual
testing

Change-Id: Iaffd3f91e63a243e35c68e553fcb8dff65a701a0
(cherry picked from commit dfb8c660310054983b12784a91edb2099798e656)