ALSA: hda: hdmi - remove redundant code comments

Remove unnecessary comments related to pin mapping on
Intel platforms.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20191115124449.20512-3-kai.vehmanen@linux.intel.com


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