qcacld-3.0: Fix addts failure for downlink direction

At present driver returns failure for all addts response frame
with the "medium time" zero in commit
Ia9247e06e3985d699f4215835a55a733738552cb. For CERT WMM 5.1.1
test bed AP response "medium time" non zero for uplink but zero
for downlink tspec. Skip the downlink tspec medium time check
for such case.

Change-Id: I803480c576e59a2d97cd5d2bec2528a0a17c760e
CRs-Fixed: 3051480

core/mac/src/pe/lim/lim_process_action_frame.c

@@ -640,7 +640,8 @@ static void __lim_process_add_ts_rsp(struct mac_context *mac_ctx,
 	 * Change the status to failure and fallthrough to send response
 	 * to SME to cleanup the flow.
 	 */
-	if (!lim_is_medium_time_valid(mac_ctx, session, addts))
+	if (addts.tspec.tsinfo.traffic.direction != SIR_MAC_DIRECTION_DNLINK &&
+	    !lim_is_medium_time_valid(mac_ctx, session, addts))
 		addts.status = STATUS_UNSPECIFIED_FAILURE;
 
 	/* deactivate the response timer */