Gracefully handle A2DP hardware offload Audio HAL service death

Register for Audio HAL service death, and restart the Audio HAL session
if necessary.

Bug: 77926419
Test: Manual: stream Bluetooth audio and kill -9 the audioserver
Change-Id: I45e83aea0fb95301e6ceadee74661dd55f8c0f66
Merged-In: I45e83aea0fb95301e6ceadee74661dd55f8c0f66
(cherry picked from commit 5c80c8653a61780f8047413d5ad9f939a8a397f3)