AP: Enable H2E on 6 GHz when SAE is used

Even if the use of H2E isn't strictly mandatory when using SAE on 6 GHz,
WPA3-Personal pushes it on 6 GHz. So lets automatically enable it by
setting sae_pwe=2. This will allow both the hunting-and-pecking and
hash-to-element to work (and be backward compatible).

Signed-off-by: Nicolas Escande <nico.escande@gmail.com>

src/ap/ap_config.c

@@ -1210,6 +1210,13 @@ static bool hostapd_config_check_bss_6g(struct hostapd_bss_config *bss)
 		return false;
 	}
 
+#ifdef CONFIG_SAE
+	if (wpa_key_mgmt_sae(bss->wpa_key_mgmt) && !bss->sae_pwe) {
+		wpa_printf(MSG_INFO, "SAE: Enabling SAE H2E on 6 GHz");
+		bss->sae_pwe = 2;
+	}
+#endif /* CONFIG_SAE */
+
 	return true;
 }