ALSA: hda - Add dock support for Thinkpad T440 (17aa:2212)

There is another Thinkpad T440 with SSID 17aa:2212 that has a dock
port.

Reported-by: Siwei Luo <sluo@smartbeans.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Merge branch 'for-linus'