Update several default firmwares
- GH60 Rev B	kairyu/tmk_keyboard_custom@38e17a8704bb35e51fcc81a5ecbf5a4de4705ece
- GH60 Rev CHN	kairyu/tmk_keyboard_custom@4ec4ad8253a2052d390eb5c2eddf2b616790a32b
- GHPad		kairyu/tmk_keyboard_custom@9414e34f5b5b81407e4f0c68fd4019f0d886dc3b