[U-Boot] env: avoid build error for boards without CONFIG_SYS_{CPU, BOARD}

[Tom Rini]

On Fri, Jun 17, 2016 at 02:24:07PM +0900, Masahiro Yamada wrote:

> If CONFIG_ENV_VARS_UBOOT_CONFIG is enabled (it is by distro), this
> code causes build error for boards without CONFIG_SYS_{CPU,_BOARD}.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

Applied to u-boot/master, thanks!

-- 
Tom
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