powerpc/scom: Use "devspec" rather than "path" in debugfs entries

This is the traditional name for device-tree path, used in sysfs,
do the same for the XSCOM debugfs files.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/sysdev/scom.c

@@ -180,7 +180,7 @@ static int scom_debug_init_one(struct dentry *root, struct device_node *dn,
 
 	debugfs_create_file("addr", 0600, dir, ent, &scom_addr_fops);
 	debugfs_create_file("value", 0600, dir, ent, &scom_val_fops);
-	debugfs_create_blob("path", 0400, dir, &ent->blob);
+	debugfs_create_blob("devspec", 0400, dir, &ent->blob);
 
 	return 0;
 }