image-fit: Use unsigned types for external data properties

The data-offset, data-position and data-size FIT properties are
stored as 32-bit unsigned values (fdt32_t), but the accessors
fit_image_get_data_offset(), fit_image_get_data_position() and
fit_image_get_data_size() return them through a signed int.

Switch the accessors and their callers to u32. This removes the
special processing of "negative" values in fit_image_get_data().

Signed-off-by: Anton Ivanov <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

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