ALSA: hda - Fix usage of "model" module parameter

A recent refactoring broke the possibility to manually specify
model name as a module parameter. This patch restores the desired
functionality.

Fixes: c21c8cf7

 ('ALSA: hda - Add fixup_forced flag')
Reported-by: Kent Baxley <kent.baxley@canonical.com>
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>