n64: move module param at the top

Move module parameters at the top of the file after macro definition &
global variables below macro definitions just like we have for other
modules.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Lauri Kasanen <cand@gmx.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>