staging: vt6655: Replace MACvTransmitBCN with VNSvOutPortB

Replace macro MACvTransmitBCN with VNSvOutPortB 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/698ce973d92065846a9db4339f017cd9e094706e.1651957741.git.philipp.g.hortmann@gmail.com


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