ALSA: hda/hdmi: change type for the 'assigned' variable

This change converts the assigned value from int type to
the bool type to retain consistency with other structure
members like 'setup', 'non_pcm' etc.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20220913070307.3234038-1-perex@perex.cz


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