[U-Boot] rockchp: rock_defconfig: remove TPL_TINY_MEMSET

[Philipp Tomsich]

> The rk3188 rock board does not need TPL, remove relate MACRO.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
> ---
> 
>  configs/rock_defconfig | 1 -
>  1 file changed, 1 deletion(-)
> 

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