ALSA: hda - Allow multiple ADCs for mic mute LED controls

Instead of refusing, allow the configuration with the multiple ADCs
(thus multiple capture switches) for enabling the mic mute LED.
This has been done for Sigmatel/IDT codecs, and we treat the OR-ed
values from all capture switches as the boolean condition.

Signed-off-by: Takashi Iwai <tiwai@suse.de>