ALSA: hda - Don't reset HP pinctl in patch_sigmatel.c

Resetting HP pinctl at the unplugged state may cause a sort of regression
on some devices because of their wrong pin configuration.

A simple workaround is to disable the pin reset.  This is ugly and may be
not good from the power-saving POV (if any), but damn simple.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: stable@kernel.org