[otbn,dv] Remove weak attributes for some more DPI functions The cunning trick of using a weak symbol for a DPI export that may or may not exist doesn't work on Xcelium. They were needed here because we supported a use case for otbn_core_model where there was no RTL to inspect. Fortunately, that use case is no longer supported (as of commit 0d0fa1a09) so we can drop them entirely. The other associated changes in the commit add some assertions to make sure that the DesignScope parameter is a nonempty string. Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
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