Fix/update the computation of the total dropped packets for LDAC and AAC

Also:
 * Print the "LDAC transmission bitrate (Kbps)"
 * Print the "LDAC adaptive bit rate encode quality mode index"
   when the LDAC quality mode is ABR

A2DP LDAC State:
  ...
  LDAC quality mode                                       : ABR
  LDAC transmission bitrate (Kbps)                        : 990
  LDAC saved transmit queue length                        : 0
  LDAC adaptive bit rate encode quality mode index        : 0

Test: A2DP streaming to headsets that support LDAC
Bug: 37287785
Change-Id: I83b22090b087eb8a1e49d1853468b7dbbf9d9ad3