CRAS a2dp: Add err log for a2dp failures
CRAS a2dp: Add err log for a2dp failures

Add error log for transport release and acquire failure.
This will help debug on future report for a2dp device unexpected
disconnection.  Also fixed license header.

BUG=chromium:246433
TEST=None

Change-Id: Ibce9ebbca4f6846796ccd283bee6c4db56d0a69d
Reviewed-on: https://gerrit.chromium.org/gerrit/66326
Reviewed-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Tested-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>
Reviewed-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>
Commit-Queue: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>

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