hostapd: enable PMKSA and OK caching for WPA3-Personal

This enables PMKSA and opportunistic key caching by default for
WPA2/WPA3-Personal, WPA3-Personal and OWE auth types.
Otherwise, Apple devices won't connect to the WPA3 network.

This should not degrade security, as there's no external authentication
provider.

Tested with OCEDO Koala and iPhone 7 (iOS 13.1).

Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit 3034f8c3b85e70b1dd9b4cd5cd33e9d2cd8be3b8)
Signed-off-by: David Bauer <mail@david-bauer.net>

package/network/services/hostapd/files/hostapd.sh

@@ -540,7 +540,14 @@ hostapd_set_bss_options() {
 			append bss_conf "rsn_preauth=1" "$N"
 			append bss_conf "rsn_preauth_interfaces=$network_bridge" "$N"
 		else
-			set_default auth_cache 0
+			case "$auth_type" in
+			sae|psk-sae|owe)
+				set_default auth_cache 1
+			;;
+			*)
+				set_default auth_cache 0
+			;;
+			esac
 		fi
 
 		append bss_conf "okc=$auth_cache" "$N"