hal: Fix policy conf parser for FLAC playback on multiple sample rate

-Apptype update for FLAC format fails as it is not listed as
supported format. By adding AUDIO_FORMAT_FLAC, corresponding apptype
is selected which enables correct audio_output profile.
-During config structure population, add logic to identify output
profile according to sampling rate in addition to format and flag.
-Currently, output policy parser sends mixer command containing
acdb id and app type only. As a result, adm opens at only one fixed
sampling rate. By sending sample rate, it enables adm open at
appropriate sample rate obtained from audio output policy conf file.

Change-Id: I014e1c139f7905d799003add43e1b74715c4367d