ALSA: hda - Revisit output_path parsing in patch_via.c

Change the order of the output-path list in a way from the DAC to the
target pin.  Also now the list include the target pin, too.

Together with this format change, simplify the arguments of
parse_output_path() function, and fix the initialization in
via_auto_init_output().

Signed-off-by: Takashi Iwai <tiwai@suse.de>