staging: vt6655: Rename MACvRegBitsOff

Fix name of a macro that uses CamelCase which is not
accepted by checkpatch.pl

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/e6bea6707f20a53d0631dd1f477ce72d36cd6f3e.1657657918.git.philipp.g.hortmann@gmail.com


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