[U-Boot] Fix default env includes to fix sandbox build

[Tom Rini]

On Wed, Jun 17, 2015 at 04:58:32PM +0100, Peter Robinson wrote:

> defconfig and sandbox fails to build due to a with with the following error:
> 
> error: expected '}' before 'BOOT_TARGET_DEVICES_references_HOST_without_CONFIG_SANDBOX'
>   CONFIG_EXTRA_ENV_SETTINGS
> 
> Based on the responaes below to the thread add linux/kconfig.h higher in th includes
> and drop the now unneeded autoconf.h lower down to ensure the default environment is
> included correctly
> 
> http://lists.denx.de/pipermail/u-boot/2015-June/216849.html
> 
> Signed-off-by: Peter Robinson <pbrobinson at gmail.com>

Reworded the commit message and applied to u-boot/master, thanks!

-- 
Tom
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