ALSA: sc6000: Assign vport directly on card's private_data

sc6000 driver tries to allocate an extra pointer for keeping the vport
address and point it over card->private_data.  But, this indirect
access is utterly superfluous, and we can keep the vport address
directly in card->private_data instead.  This will simply the code and
avoid confusion.

Link: https://lore.kernel.org/r/20210720162837.6026-1-tiwai@suse.de


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