hal : Modify the kernel buffer to 32ms.

 - Reduced the kernel buffer size to 32ms for deep buffer &
   pcm offload use cases
 - Handled Eos of DD/DDP Assoc stream to fix blocking during drain.
 - Adding support for AC4 stream playback.

Change-Id: Id159174d6ecf1424766d1471932d5403fd5ddc5e