ALSA: hda - Fix the pin nid assignment in patch_hdmi.c

This fixes the regression introduced by the commit d0b1252d

 for
refactoring simple_hdmi*().  The pin NID wasn't assigned correctly.

Reported-by: Annie Liu <annieliu@viatech.com.cn>
Signed-off-by: Takashi Iwai <tiwai@suse.de>