qcacmn: Handle EV_DOWN to do peer cleanup in MLO_SYNC_WAIT

Initially there were no peers connected to AP VDEV when the VDEV was in
MLO_SYNC_WAIT state. So EV_DOWN would directly move to STOP state and
proceed with bringing down the vdev.

With CSA in MLO, there can peers connected to AP VDEV in MLO_SYNC_WAIT
which have to be deleted/cleaned up as part EV_DOWN event handling.

Added change to handle the DOWN event as done in START/UP_ACTIVE state.
By moving to SUSPEND, the clients are disconnected then moving to
STOP state.

Change-Id: Ida71914b9719395ab666805cc7072491ffa9baf1
CRs-Fixed: 3308207

umac/mlme/vdev_mgr/core/src/vdev_mlme_sm.c

@@ -1704,8 +1704,8 @@ static bool mlme_vdev_subst_mlo_sync_wait_event(void *ctx, uint16_t event,
 		break;
 
 	case WLAN_VDEV_SM_EV_DOWN:
-		mlme_vdev_sm_transition_to(vdev_mlme, WLAN_VDEV_S_STOP);
-		mlme_vdev_sm_deliver_event(vdev_mlme, WLAN_VDEV_SM_EV_STOP_REQ,
+		mlme_vdev_sm_transition_to(vdev_mlme, WLAN_VDEV_S_SUSPEND);
+		mlme_vdev_sm_deliver_event(vdev_mlme, event,
 					   event_data_len, event_data);
 		status = true;
 		break;