The mic mute led on dell laptops is controlled by the wmi driver.
Followed this part being merged to the kernel, we add the mic mute led
hook in the hda driver.
Signed-off-by: NDavid Henningsson <david.henningsson@canonical.com>
Signed-off-by: NHui Wang <hui.wang@canonical.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>