doc: Remove FIT documentation that is elsewhere

Before 9d0750064e (doc: Move external FIT docs into the main body), the
FIT property data-size was not a mandatory property and still it is not
expected to be set alongside the data property.

Move the data-size property to the "Conditionally mandatory property"
section, where it actually belongs.

Signed-off-by: Sam Povilus <sam.povilus@amd.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

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