boot/fit: read default-config property from the configurations node

In fit_print_contents() the default configuration's unit name is read by
calling fdt_getprop() with noffset rather than confs_noffset. Today this
happens to work by coincidence: the preceding loop walks /images using
fdt_next_node(), and when iteration leaves the subtree libfdt returns
the offset of the next sibling in DFS order, which by FIT layout
convention is /configurations. The depth counter then drops below zero
and the loop exits with noffset still pointing at /configurations.

This relies on /images and /configurations being adjacent siblings and
on the implementation detail of fdt_next_node()'s post-exhaustion
return value. It also blocks a follow-up conversion to
fdt_for_each_subnode(), whose post-loop loop variable is a negative
error code rather than a valid offset.

Use confs_noffset directly, which the comment immediately above the
call already names as the source.

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

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