A2DP: When changing codec, resume the audio session after AVDTP_Reconfig done

When changing the codec configuration, we need to wait for AVDTP data
channel opened again, so have the updated MTU to share with our encoder.
This had to be done before starting the new HAL session, or might
provide an incorrect configuration with IOP issues.

This also reverts commit 97dd8bc5 since
we had all latest configurations before starting the new HAL session,
and is no needed to force update.

Bug: 132217607
Bug: 134125165
Test: manually
Change-Id: Id82f506190729881349f4ac8d2f8aef38f946ef2