.gitignore: ignore include/config/*

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/.gitignore b/.gitignore
index ffe0cc7..cba5eac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,6 +51,10 @@
 /spl/*
 /tpl/
 
+#
+# Generated include files
+#
+/include/config/
 /include/generated/
 /include/spl-autoconf.mk
 /include/tpl-autoconf.mk