asoc: msm-compress: Reset channel map flag during close.

For some of the clips improper channel map is applied when not
set from userspace.
Reset channel map flag to apply default channel map.

Change-Id: Ic128b835ecea632c99fba5b14471fc76e767b80e
Signed-off-by: Preetam Singh Ranawat <apranawat@codeaurora.org>