[U-Boot] rockchip: rock: remove CONFIG_ENV_OFFSEt

[Philipp Tomsich]

> We use the same default ENV setting in rockchip_common.h for all SoC.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
> Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> ---
> 
>  include/configs/rock.h | 14 --------------
>  1 file changed, 14 deletions(-)
> 

Applied to u-boot-rockchip, thanks!