ALSA: hda - Handle missing NID 0x1b on ALC259 codec

BugLink: http://bugs.launchpad.net/bugs/582199
BugLink: http://bugs.launchpad.net/bugs/586418
BugLink: http://bugs.launchpad.net/bugs/588031

Since ALC259/269 use the same parser of ALC268, the pin 0x1b was ignored
as an invalid widget.  Just add this NID to handle properly.
This will add the missing mixer controls for some devices.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
(cherry picked from commit 5d4abf93ea3192cc666430225a29a4978c97c57d in
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git)

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>