[ALSA] hda-codec - support for Agere's HDA soft modem

Modules: HDA Codec driver

This adds support for Agere's variant of Si3054/5 based HDA modem.

Signed-off-by: Sasha Khapyorsky <sashak@alsa-project.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>