Bluetooth: host: Fix SC indication on encrypt change

The SC indication can be sent only if the GATT Service Changed is
enabled in the configuration. Change fixes build issues related to
implicit sc_indicate declaration when Service Changed is disabled.

Fixes: zephyrproject-rtos#54813

Signed-off-by: Marek Pieta <Marek.Pieta@nordicsemi.no>

subsys/bluetooth/host/gatt.c

@@ -5712,7 +5712,7 @@ void bt_gatt_encrypt_change(struct bt_conn *conn)
 
 	bt_gatt_foreach_attr(0x0001, 0xffff, update_ccc, &data);
 
-#if defined(CONFIG_BT_SETTINGS)
+#if defined(CONFIG_BT_SETTINGS) && defined(CONFIG_BT_GATT_SERVICE_CHANGED)
 	if (!bt_gatt_change_aware(conn, false)) {
 		/* Send a Service Changed indication if the current peer is
 		 * marked as change-unaware.