FT: Force key configuration after association in FT-over-DS

This seems to be needed at least with mac80211 when a STA is using
FT-over-DS to reassociate back to the AP when the AP still has the
previous association state.

src/ap/wpa_auth_i.h

@@ -116,6 +116,7 @@ struct wpa_state_machine {
 					   * Request */
 	u8 r0kh_id[FT_R0KH_ID_MAX_LEN]; /* R0KH-ID from FT Auth Request */
 	size_t r0kh_id_len;
+	int ft_over_ds;
 #endif /* CONFIG_IEEE80211R */
 };