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

(cherry picked from commit 13405d11)

Change-Id: I93c5eb9786664b1251dc7c4d2d846d33eb58e72c