commit b78562b1 upstream.

The workaround to force VREF50 for dallas/hp model with ALC861VD
was introduced in commit 8fdcb6fe,
but it contained wrong pincap override bits.

This patch fixes to exclude VREF80 pincap bit correctly.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>