qcacmn: Add WMI API to send beacon offload control

Beacon offload control WMI command is used to control beacon tx in
beacon offload enabled mode. Add WMI API to send this command to FW.

Change-Id: I8b340b69ff508aaf80b9a80de044b0189b947a66
CRs-Fixed: 2140255

wmi/inc/wmi_unified_priv.h

@@ -1071,6 +1071,9 @@ QDF_STATUS
 (*send_coex_config_cmd)(wmi_unified_t wmi_handle,
 			struct coex_config_params *param);
 
+QDF_STATUS (*send_bcn_offload_control_cmd)(wmi_unified_t wmi_handle,
+			struct bcn_offload_control *bcn_ctrl_param);
+
 QDF_STATUS (*extract_wds_addr_event)(wmi_unified_t wmi_handle,
 	void *evt_buf, uint16_t len, wds_addr_event_t *wds_ev);