ALSA: hda: Drop superfluous driver->ops NULL checks

After all conversions, driver->ops became a must in most places
(except for the codec power setup which might be called before binding
to the codec driver), hence we can get rid of the superfluous
driver->ops NULL checks, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250709160434.1859-26-tiwai@suse.de