[U-Boot] spl: make CONFIG_OF_EMBED pass dts through fdtgrep

[Tom Rini]

On Tue, Nov 21, 2017 at 12:29:56PM +0000, Goldschmidt Simon wrote:

> Building spl with CONFIG_OF_EMBED enabled results in an error message
> on my board: "SPL image too big". This is because the fdtgrep build
> step is only executed for CONFIG_OF_SEPARATE.
> 
> Fix this by moving the fdtgrep build step ('cmd_fdtgreo') from
> scripts/Makefile.spl to dts/Makefile so that the reduced dtb is
> available for all kinds of spl builds.
> 
> The resulting variable name for the embedded device tree blob changes,
> too, which is why common.h and fdtdec.c have tiny changes.
> 
> Signed-off-by: Simon Goldschmidt <sgoldschmidt at de.pepperl-fuchs.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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