staging: vt6655: Replace VNSvOutPortB with iowrite8

Replace macro VNSvOutPortB with iowrite8 because it replaces
just one line.
The name of macro and the arguments use CamelCase which
is not accepted by checkpatch.pl

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/38611512677a18f63d9266cde1d20758c0feeb6e.1651957741.git.philipp.g.hortmann@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>