[U-Boot] travis: Add srecord package

[Tom Rini]

On Thu, Mar 14, 2019 at 01:01:24AM +0100, Marek Vasut wrote:

> At least MIPS Boston currently uses srec_cat tool to fiddle with
> srecords. There will be other platforms coming, so install the
> tool to prevent build problems.
> 
> Signed-off-by: Marek Vasut <marek.vasut+renesas at gmail.com>
> Cc: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
> Cc: Michal Simek <michal.simek at xilinx.com>
> Cc: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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