ALSA: hda/realtek - Fix a regression for mute led on Lenovo Carbon X1

Need to chain the THINKPAD_ACPI, otherwise the mute led will not
work.

Fixes: d2cd795c

 ("ALSA: hda - fixup for the bass speaker on Lenovo Carbon X1 7th gen")
Cc: <stable@vger.kernel.org>
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Link: https://lore.kernel.org/r/20200219052306.24935-1-hui.wang@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>