hal: Enable direct playback support for AUDIO_FORMAT_PCM_FLOAT

-Add changes to support PCM_FLOAT format using direct track.
-For targets supporting true 32 bit, convert FLOAT pcm data
to 32 bit.
-Targets which dont support true 32 bit, convert FLOAT or
32 bit input to 24 bit Packed in HAL.

Change-Id: I8052c8b878bbd4d70c0453df054953d494773b0a