stdlib: Fix CustomResource metadata setting

The 'metadata' parameter was not being passed to the AbstractResource
superclass.

Change-Id: Id25d82baa2039c992645e6807a46e7c329520bb7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53086
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/src/python/gem5/resources/resource.py b/src/python/gem5/resources/resource.py
index 3203191..0b9b128 100644
--- a/src/python/gem5/resources/resource.py
+++ b/src/python/gem5/resources/resource.py
@@ -78,7 +78,7 @@
         :param local_path: The path of the resource on the host system.
         :param metadata: Add metadata for the custom resource.
         """
-        super().__init__(local_path=local_path)
+        super().__init__(local_path=local_path, metadata=metadata)
 
 
 class Resource(AbstractResource):