ALSA: intel8x0m: enable AMD8111 modem

AMD 8111 southbridges contain a controller for MC'97 modem. Enable support
for this controller in intel8x0m driver.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>