qcacld-3.0: Remove last_radar_found_channel from tSapDfsInfo

The last_radar_found_channel field in tSapDfsInfo is unused,
so remove it.

Change-Id: I7afb516b01f5f696ea9fb9ad386daf2b0767e754
CRs-Fixed: 2380769

core/sap/inc/sap_api.h

@@ -603,7 +603,6 @@ typedef struct sSapDfsInfo {
 	 * detected on current Channel
 	 */
 	uint8_t target_channel;
-	uint8_t last_radar_found_channel;
 	uint8_t ignore_cac;
 	eSapDfsCACState_t cac_state;
 	uint8_t user_provided_target_channel;