[U-Boot] kbuild: allow null board for spl build

[Tom Rini]

On Fri, Apr 25, 2014 at 09:54:31PM +0900, Masahiro Yamada wrote:

> Commit 33a02da0 supported "<none>" for the board field of boards.cfg.
> But it missed to modify spl/Makefile.
> 
> This commit provides the flexibility so we can use "<none>" board
> in SPL too.

Applied to u-boot/master, thanks!

-- 
Tom
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