Add driver wrapper callback for WPS push button pressed

This avoids the need to include ../hostapd/wps_hostapd.h into the
driver wrappers.

hostapd/drv_callbacks.c

@@ -461,3 +461,9 @@ void hostapd_probe_req_rx(struct hostapd_data *hapd, const u8 *sa,
 		hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 					sa, ie, ie_len);
 }
+
+
+void hostapd_button_pushed(struct hostapd_data *hapd)
+{
+	hostapd_wps_button_pushed(hapd);
+}

src/drivers/driver.h

@@ -1597,5 +1597,6 @@ struct hostapd_data * hostapd_sta_get_bss(struct hostapd_data *hapd,
 					  const u8 *addr);
 void hostapd_probe_req_rx(struct hostapd_data *hapd, const u8 *sa,
 			  const u8 *ie, size_t ie_len);
+void hostapd_button_pushed(struct hostapd_data *hapd);
 
 #endif /* DRIVER_H */

src/drivers/driver_atheros.c

@@ -65,8 +65,6 @@
 #include "eloop.h"
 #include "priv_netlink.h"
 #include "l2_packet/l2_packet.h"
-
-#include "../hostapd/wps_hostapd.h"
 #include "common/ieee802_11_defs.h"
 
 
@@ -849,7 +847,7 @@ madwifi_wireless_event_wireless_custom(struct madwifi_driver_data *drv,
 		/* PROBLEM! this event is received for ALL BSSs ...
 		 * so all are enabled for WPS... ugh.
 		 */
-		hostapd_wps_button_pushed(drv->hapd);
+		hostapd_button_pushed(drv->hapd);
 	} else if (strncmp(custom, "Manage.prob_req ", 16) == 0) {
 		/*
 		 * Atheros driver uses a hack to pass Probe Request frames as a