ASoC: msm: qdsp6v2: Add a new waitqueue and state for mem map/unmap

All of the commands being sent to the DSP are using cmd_state flag
which can be overwritten when several commands are sent at the same
time. This results in Memory map/unmap command timing out. The change
will separate the memory flag from flags for other commands so that
they do not overwrite each other.

CRs-fixed: 673781
Change-Id: I61e059f402feb2c4e1e3dbed1825990456e78471
Signed-off-by: Damir Didjusto <damird@codeaurora.org>