test: fit: regression test for default-config print with reversed node order

Add a test that builds a FIT whose /configurations node is defined
before /images in the source, runs iminfo, and asserts that the
"Default Configuration: '<name>'" line appears in the output.

Before the fix in the preceding commit ("boot/fit: read default-config
property from the configurations node"), fit_print_contents() read the
default-config property using the loop variable left over from iterating
/images children. With /images defined first that variable accidentally
pointed at /configurations and the line printed correctly; with
/configurations defined first the read returned NULL and the line was
silently omitted. The new test exercises the latter layout, which had
no coverage.

iminfo and the fit_print_contents() path had no test coverage at all
before this commit.

Signed-off-by: Aristo Chen <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

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