ASoC: msm: qdsp6v2: Add the matrix mixer call during ASM loopback

Add support for matrix mixer command. The render window start and
end are set up before RUN CMD for ASM loopback is issued. This
will ensure that audio data is not dropped and audio quality
is good.

CRs-fixed: 667925
Change-Id: I406d86e9805d9f57613c0349f11cfc729ef7a24c
Signed-off-by: Damir Didjusto <damird@codeaurora.org>