[U-Boot] [U-Boot, 08/15] spl: rename config item SPL_ATF_SUPPORT to SPL_ATF

[Philipp Tomsich]

> Having CONFIG_SPL_ATF seems more natural.
> Rename it, while it it is easy and there's few boards that use it
> (only RK3399 and RK3368 boards).
> 
> Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> ---
> 
>  common/spl/Kconfig  | 2 +-
>  common/spl/Makefile | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 

Applied to u-boot-rockchip, thanks!