hal: retry a2dp path start up when failed

Check if a2dp path start failed and do retry from
out_write to recover the path is possible, which
can avoid blocking write if path set up failed.

Bug: 148926518
Test: manual test
Change-Id: If0df472ca0fb6454588fe2b58f1b0cc53bb6e650
Signed-off-by: Eric Huang <ericsphuang@google.com>
3 files changed