leds: leds-ss4200: remove __initdata marker

Remove __initdata marker, because it is not right for a module
parameter. It will make the kernel oops problem.

(cooloney@gmail.com: update commit message since it's really a
wrong notation)

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>