ASoC: DPCM: make some DPCM API calls non static for compressed usage

Change-Id: I9dc2b00cfd36528c46516329253175e6f69f734e
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Git-commit: d1480d5781c77bd964340a3698eef4f758ba2973
Git-repo: https://android.googlesource.com/kernel/msm


[dhakumar@codeaurora.org: resolved merge conflicts]
Signed-off-by: Dhananjay Kumar <dhakumar@codeaurora.org>