[ALSA] hda-codec - Add HP Lucknow 5.1 support

Added HP Lucknow (ALC888) 5.1 surround support based on ALC883 6-channel
threestack with changes in channel routing.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>