ALSA: usb-audio: Replace runtime->status->state reference to runtime->state

The recent change in ALSA core allows drivers to get the current PCM
state directly from runtime object.  Replace the calls accordingly.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20220926135558.26580-8-tiwai@suse.de


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