staging: vt6655: Replace VNSvInPortD with ioread32

staging: vt6655: Replace VNSvInPortD with ioread32

Replace macro VNSvInPortD with ioread32 and as it was
the only user, it can now be removed.
The name of macro and the arguments use CamelCase which
is not accepted by checkpatch.pl

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/3945d32053898e5f9771d6f742ae118ca56943ce.1651431640.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>