[otbn] Update block diagram for RND/URND

Fixes #6458

Signed-off-by: Greg Chadwick <gac@lowrisc.org>
diff --git a/hw/ip/otbn/doc/otbn_blockarch.svg b/hw/ip/otbn/doc/otbn_blockarch.svg
index 6bb875a..1df71a3 100644
--- a/hw/ip/otbn/doc/otbn_blockarch.svg
+++ b/hw/ip/otbn/doc/otbn_blockarch.svg
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