Enforce that IEEE 802.1X EAPOL-Key Replay Counter increases

While this should not happen in practical use cases,
wpa_get_ntp_timestamp() could return the same value when called twice in
a row quickly. Work around that case by enforcing a new Replay Counter
value based on stored last value.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/ap/hostapd.h

@@ -384,6 +384,8 @@ struct hostapd_data {
 	unsigned int num_backlogged_sta;
 	unsigned int airtime_weight;
 #endif /* CONFIG_AIRTIME_POLICY */
+
+	u8 last_1x_eapol_key_replay_counter[8];
 };