qcacld-3.0: Add fallthrough comment between switch cases

Currently, there is no break statement between switch cases in
function hdd_stop_present_mode(), here first case has to
fall through the next case instead of using break statement.

Add /* fallthrough */ comment between the cases.

Change-Id: I518628fb8ee084a0ea8de5c98c18a9a6c20b2637
CRs-Fixed: 2233177

core/hdd/src/wlan_hdd_main.c

@@ -12333,6 +12333,7 @@ static void hdd_stop_present_mode(struct hdd_context *hdd_ctx,
 		hdd_info("Release wakelock for monitor mode!");
 		qdf_wake_lock_release(&hdd_ctx->monitor_mode_wakelock,
 				      WIFI_POWER_EVENT_WAKELOCK_MONITOR_MODE);
+		/* fallthrough */
 	case QDF_GLOBAL_MISSION_MODE:
 	case QDF_GLOBAL_FTM_MODE:
 		hdd_abort_mac_scan_all_adapters(hdd_ctx);