ASoC: compress: Add suport for DPCM into compressed audio

Allow compressed audio streams to traverse the DAPM graph of DAIs
like PCM streams.

Change-Id: I15f227b73122071dfad106705a943199b679c273
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Git-commit: d314c1c37de41c689dbfcfff736a08c814a0d9ba
Git-repo: https://android.googlesource.com/kernel/msm


Signed-off-by: Dhananjay Kumar <dhakumar@codeaurora.org>