Offload snd_usb_parse_audio_interface() function
which became quite long after adding UAC3 spec support.

Move class-specific parts of uac3 parsing to separate
function which now produce audioformat structure that
is ready to be fed to snd_usb_add_audio_stream().
Signed-off-by: NRuslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>