floss: Support playback for various SCO packet

- Refine mSBC playback related code and move it into btm_sco_hci.cc
  under sco::wbs
- Change to queue the encoded mSBC packets instead of directly sending
  it. This is essential for SCO packet size that is not 60.
- Support SCO packet size 72.

Bug: 235901463
Tag: #floss
Test: system/gd/cert/run & Build and verify WBS playback and recording
works on platforms with packet size 60 and 72

Change-Id: Ie601f3f2ba280a1c697278828df5a43bbfbf7b61