staging: vt6655: Replace MACvWriteISR with VNSvOutPortD

Replace macro MACvWriteISR with VNSvOutPortD and as it
was the only user, it can now be removed.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/80cd68a83807209230a898ab0260188adfad4158.1653203927.git.philipp.g.hortmann@gmail.com


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