[U-Boot] [U-Boot, v2, 2/2] rockchip: fix incorrect detection of ram size

[Philipp Tomsich]

> Taken from coreboot's src/soc/rockchip/rk3288/sdram.c
> 
> Without this change, my u-boot build for the asus c201 chromebook (4GiB)
> is incorrectly detected as 0 Bytes of ram.
> 
> Signed-off-by: Marty E. Plummer <hanetzer at startmail.com>
> ---
>  arch/arm/mach-rockchip/sdram_common.c | 2 ++
>  1 file changed, 2 insertions(+)
> 

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