fix naming of config files in patch

patches/config.patch

@@ -1,5 +1,5 @@
---- config-stock	2018-04-30 19:19:53.667563564 -0400
-+++ config-surface	2018-04-30 19:22:03.105721430 -0400
+--- a/config	2018-04-30 19:19:53.667563564 -0400
++++ b/config	2018-04-30 19:22:03.105721430 -0400
 @@ -52,7 +52,7 @@
  CONFIG_INIT_ENV_ARG_LIMIT=32
  CONFIG_CROSS_COMPILE=""