ASoC: msm: Add MM6 routing

Add MM6 routing commands. This will enable to route
data through ASM loopback through MM6. MM6 will be
used to make the connections for the asm loopback.

Change-Id: Ife0e94e6355144ce2ced4a936d946d2bd3973edb
Signed-off-by: Damir Didjusto <damird@codeaurora.org>