staging: vt6655: Convert macro vt6655_mac_write_bssid_addr to function

Convert macro vt6655_mac_write_bssid_addr to static function.
checkpatch.pl does not accept multiline macros.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/caecf7287d92c5d25ba0dfc16a24a6ce4aa67d55.1656835310.git.philipp.g.hortmann@gmail.com


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