staging: vt6655: Convert macro vt6655_mac_word_reg_bits_on to function

Convert macro vt6655_mac_word_reg_bits_on to function.
checkpatch.pl does not accept multiline macros.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/255c7f5a5e98a399aa4e299e7cf567016bd86d60.1657657918.git.philipp.g.hortmann@gmail.com


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