Don't trigger AVDTP Suspend in response to AVDTP Suspend+Start from remote

If the remote device sent us AVDTP Suspend, and then AVDTP Start, don't
trigger AVDTP Suspend from the local device in response to the AVDTP Start.

Also:
 * Add a call btif_av_stream_start_offload() inside btif_a2dp_on_started()
   if we were started remotely.
 * Fix the order of calling btif_a2dp_on_started() and triggering
   an internal BTIF_AV_SUSPEND_STREAM_REQ_EVT event. Otherwise,
   BTA Suspend might be called before btif_av_stream_start_offload()

Bug: 110015851
Bug: 110186160
Test: Manual
Change-Id: I908d19f8caf5130b96a64153ff39bd4b52879713