[ALSA] Fix/add support of Realtek ALC883 / ALC888 and ALC861 codecs

Patch from Realtek:
- Fix ALC883 support code
- Add support of ALC888 codec
- Add ALC660 support (ALC861-compatible)
- Add HP xw4400/6400/8400/9400 support (model=hp-bpc)
- Code clean-up: fix spaces and indentation

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>