staging: vt6655: Remove unused macros in mac.h

Remove unused macros with do-while(0) loop or CamelCase in mac.h as
they are not accepted by checkpatch.pl

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/78f72d0aa3d1bdddf3c415fd4c458399aa5e7cbf.1649103348.git.philipp.g.hortmann@gmail.com


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