test: py: add regression test for fit_import_data() stale state

Build an external-data FIT, remove the data-offset property from the
second image so that only its data-size remains, and re-process the
result with mkimage -F. mkimage must reject the malformed FIT with a
clear diagnostic from the hashing stage. Previously the stale per-image
state in fit_import_data() made the import copy the first image's data
into the second image and abort without printing anything.

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

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