wlan: Fix memory leak while processing smd response

Memory allocated for the list in WCTS_smd_resp_process
to process smd response is not freed in its processing
callback resulting in memory leak.

To address this free the allocated list in processing callback.

Change-Id: I9ede69d49bad8ba9e2d22756844e222d4508eda3
CRs-Fixed: 2730281