enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/drivers/usb/musb/musb_debugfs.c
..
..
@@ -325,7 +325,7 @@
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 {
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 	struct dentry *root;
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-	root = debugfs_create_dir(dev_name(musb->controller), NULL);
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+	root = debugfs_create_dir(dev_name(musb->controller), usb_debug_root);
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 	musb->debugfs_root = root;
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 	debugfs_create_file("regdump", S_IRUGO, root, musb, &musb_regdump_fops);