[ALSA] hda-codec - Fix HP Nettle 5.1 output

Fixed HP Nettle 6ch/8ch channel routing based on ALC883 sixstack and
swapping rear and center/LFE in verbs and mixer settings.

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