ALSA: hda - Preliminary support for new Conexant audio codecs

This patch adds the preliminary support for new Conexant audio codecs with
14f1:5097, 14f1:5098, 14f1:50a1, 14f1:50a2, 14f1:50ab, 14f1:50ac,
14f1:50b8 and 14f1:50b9.

Unlike other Conexant parsers, this is designed to be mostly automatic,
parsing from BIOS pin configurations.
Signed-off-by: Takashi Iwai <tiwai@suse.de>