md5-cache: allow anyone to update

BUG=b:242194202
TEST=CQ passes

Change-Id: I71b9e0f9490ef8ffcfe6674ceef24a05d3f819ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/3877682
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
diff --git a/metadata/md5-cache/OWNERS b/metadata/md5-cache/OWNERS
new file mode 100644
index 0000000..1ae1238
--- /dev/null
+++ b/metadata/md5-cache/OWNERS
@@ -0,0 +1,2 @@
+# Contents in here are generated.
+*