[U-Boot] rockchip: rk3036: fix grf macro define

[Philipp Tomsich]

> Some of macros definition are not correct, fix them according to TRM.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
> Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> ---
> 
>  arch/arm/include/asm/arch-rockchip/grf_rk3036.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

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