Handle properly AVDTP SetConfig from the A2DP Sink device

If the remote device is proactive and sends AVDTP SetConfig after
re-connection before the local device gets the chance to do it, the
internal codec setup state might be inconsistent.

* Fix the internal logic when the local device is Acceptor inside
  file bta_av_co.cc, and simplify some of the code.
* Fix the handling of p_scb->sep_info_idx inside bta_av_save_caps()
  when receiving capabilities from the remote device.
* Add new A2dpCodecConfig::setPeerCodecCapabilities() method that is
  implemented by each codec.

Bug: 77525584
Test: Manual - initiate connection by Momentum 2.0 Wireless Headset.
      Connect/disconnect/reconnect multiple headsets.

Change-Id: I456df7c8a2fa0758c0908a4628c4dfae3259dbdb