[U-Boot] [U-Boot, 16/18] rockchip: gpio: remove outdate/misleading comment

[Philipp Tomsich]

> Remove a comment claiming that this driver only supports the RK3288,
> as we also use it on the RK3368, RK3399 and (most likely) on other
> variants.
> 
> Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> ---
> 
>  drivers/gpio/rk_gpio.c | 1 -
>  1 file changed, 1 deletion(-)
> 

Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>