Support float WAV & FLAC extraction

Previously all WAV/FLAC files were extracted as 16 bit data.
Changes this so that 24/32 bit are extracted as float data
to maintain the higher quality.

Note: Update for master branch supersedes iot branches.

Bug: 63770882
Bug: 110480091
Test: Used media player to play 24 bit, 32 bit, and float wav files, plus 16 bit and 24 bit FLAC files,
ensured data went through successfully without loss of quality
Change-Id: Ic09bd2fe994bbf3ed8441549904712c534030c96