esp_wifi: Remove direct call of malloc() and free()

components/esp_wifi/lib

@@ -1 +1 @@
-Subproject commit f26ce4065080b3cad7529725756f185444ee31ec
+Subproject commit c1a8747dab1ef3a138195b0a7e5de8dd9dfe539e

components/wpa_supplicant/src/ap/wpa_auth.c

@@ -166,7 +166,7 @@ static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
     if (alg == WIFI_WPA_ALG_IGTK) {
 	if (key) {
 	    wpa_printf (MSG_DEBUG, "%s : igtk idx %d", __func__, idx);
-	    wifi_wpa_igtk_t *igtk = malloc(sizeof(wifi_wpa_igtk_t));
+	    wifi_wpa_igtk_t *igtk = os_malloc(sizeof(wifi_wpa_igtk_t));
 
 	    if (igtk != NULL) {
 		memcpy(&igtk->igtk[0], key, WPA_IGTK_LEN);