Suppress AVDTP delay reporting logs per data packet

If AVDTP delay reporting is enabled, then several log messages
will be printed by default practically for each audio data packet.
Change the log level for those messages to DEBUG.

Also:
 * Add missing event decoding for A2DP_CTRL_GET_PRESENTATION_POSITION
 * Remove "default" switch statement inside audio_a2dp_hw_dump_ctrl_event()
   to catch missing "case" statements if a new tA2DP_CTRL_CMD event is
   added in the future.

Bug: 32755225
Test: Manual - A2DP streaming, check the logcat output
Change-Id: I3d1b1c2f6532c72af0e1e7aa5566572e13ed1684