misc: qcom: qdsp6v2: initialize wma_config_32

Not all memebers of wma_config_32 are set before they are used which
might lead to invalid values being passed and used. To fix this issue
initialize all member variables of struct wma_config_32 to 0 before
assigning specific values individually.

Change-Id: Ibb082ce691625527e9a9ffd4978dea7ba4df9e84
CRs-Fixed: 1054352
Signed-off-by: Siena Richard <sienar@codeaurora.org>