[U-Boot] dtbo: Fix dtbo generation rules

[Tom Rini]

On Mon, Feb 11, 2019 at 02:51:02PM +0100, Michal Simek wrote:

> Take the first prerequisite (dts overlay file) instead of standard
> input.
> 
> Signed-off-by: Michal Simek <michal.simek at xilinx.com>

Applied to u-boot/master, thanks!

-- 
Tom
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