[U-Boot] kbuild: avoid race between dtbs and dt/dt.dtb targets

[Tom Rini]

On Thu, Jun 23, 2016 at 01:53:46PM +0900, Masahiro Yamada wrote:

> If the final targets depend on both "dtbs" and "dts/dt.dtb",
> and -j option is given to the command line, multiple threads
> descend into the dts/ directory, which causes build error.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> Tested-by: Andreas Dannenberg <dannenberg at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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