[U-Boot] Makefile: drop unused cpp_cfg macro

[Tom Rini]

On Mon, Jun 18, 2018 at 07:59:25AM +0300, Baruch Siach wrote:

> Commit e19b0fb4851f (kbuild: generate u-boot.cfg as a byproduct of
> include/autoconf.mk) removed the use of the cpp_cfg macro in Makefile,
> but forgot to remove its definition.
> 
> Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>
> Reviewed-by: Masahiro Yamada <yamada.masahiro at socionext.com>

Applied to u-boot/master, thanks!

-- 
Tom
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