DFS: Handle radar event when CAC actived correctly

When we have CAC active and receive a radar event, we should ignore
CAC_ABORT event and handle channel switch in the radar event handler.

Signed-hostap: Janusz Dziedzic <janusz.dziedzic@tieto.com>

src/ap/hostapd.h

@@ -152,6 +152,9 @@ struct hostapd_data {
 
 	int parameter_set_count;
 
+	/* DFS specific parameters */
+	int cac_started;
+
 	/* Time Advertisement */
 	u8 time_update_counter;
 	struct wpabuf *time_adv;