sh: provide generic arch_debugfs_dir.

While sh previously had its own debugfs root, there now exists a
common arch_debugfs_dir prototype, so we switch everything over to
that.  Presumably once more architectures start making use of this
we'll be able to just kill off the stub kdebugfs wrapper.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/asids-debugfs.c b/arch/sh/mm/asids-debugfs.c
index cd8c3bf3..74c03ec 100644
--- a/arch/sh/mm/asids-debugfs.c
+++ b/arch/sh/mm/asids-debugfs.c
@@ -63,7 +63,7 @@
 {
 	struct dentry *asids_dentry;
 
-	asids_dentry = debugfs_create_file("asids", S_IRUSR, sh_debugfs_root,
+	asids_dentry = debugfs_create_file("asids", S_IRUSR, arch_debugfs_dir,
 					   NULL, &asids_debugfs_fops);
 	if (!asids_dentry)
 		return -ENOMEM;