test: spl: check load_simple_fit() rejects an oversized data-size

Add a regression test that builds a FIT with external data, inflates
the data-size property far beyond the image and any plausible load
region, and confirms that spl_load_simple_fit() returns -EFBIG instead
of reading the declared size off the device. Without the bounds check
in load_simple_fit() this test overruns memory and crashes; with it the
load is rejected cleanly.

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

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