ALSA: hda - Add Realtek ALC280 codec support

This chip looks very similar to ALC269 and ALC27* variants. The bug reporter
has verified that sound was working after this patch had been applied.

Cc: stable@kernel.org
BugLink: https://bugs.launchpad.net/bugs/1017017


Tested-by: Richard Crossley <richardcrossley@o2.co.uk>
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>