Fix A2DP metrics session duration

* Add one extra item in the A2DPSession message to keep track of audio
  playback time for A2DP source

Bug: 33694310
Test: code compilation
Merged-In: Iee1e47997bf9cf9ba3f7f812c965eab36f19c0f4
Change-Id: Iee1e47997bf9cf9ba3f7f812c965eab36f19c0f4
(cherry picked from commit 4308e8f5f34b668f48cb50fbbdac77e45d04e432)
1 file changed