[U-Boot] Changed syntax for dumpimage, failing tests

[Vagrant Cascadian <vagrant@debian.org>]

The syntax for dumpimage was changed since v2019.01, but
test/image/test-imagetools.sh wasn't updated with the new syntax.

While the change may make sense, it breaks existing behavior, and that
has it's drawbacks...

In any case, the tests shouldn't fail.

I believe this is the commit that changed it:

commit 12b831879a765722c1a94ca75c6adb6f80759cd9
Author: Martyn Welch <martyn.welch@collabora.com>
Date:   Sat Jan 26 02:31:51 2019 +0000

    tools: dumpimage: Simplify arguments

    The dump image utility has very confusing syntax. If called to list
    image contents ("-l") it takes the image name as a positional
    argument. If the utility is called to extract something from the
    image, the image must be provided via the optional argument "-i" as
    well as the positional argument but the value passed in the
    positional argument will be completely ignored.

    Simplify dumpimage by always providing the image as the first
    positional argument. Assume we want to dump something from the image
    if we do not provide the "-l" option for now.


live well,
  vagrant
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