[otbn] Add known asserts to all outputs

The EDN outputs got added without "value known" asserts. Add them.

Signed-off-by: Philipp Wagner <phw@lowrisc.org>
diff --git a/hw/ip/otbn/rtl/otbn.sv b/hw/ip/otbn/rtl/otbn.sv
index 4cc5895..2ce6f5a 100644
--- a/hw/ip/otbn/rtl/otbn.sv
+++ b/hw/ip/otbn/rtl/otbn.sv
@@ -766,8 +766,10 @@
   // All outputs should be known value after reset
   `ASSERT_KNOWN(TlODValidKnown_A, tl_o.d_valid)
   `ASSERT_KNOWN(TlOAReadyKnown_A, tl_o.a_ready)
+  `ASSERT_KNOWN(IdleOKnown_A, idle_o)
   `ASSERT_KNOWN(IntrDoneOKnown_A, intr_done_o)
   `ASSERT_KNOWN(AlertTxOKnown_A, alert_tx_o)
-  `ASSERT_KNOWN(IdleOKnown_A, idle_o)
+  `ASSERT_KNOWN(EdnRndOKnown_A, edn_rnd_o)
+  `ASSERT_KNOWN(EdnUrndOKnown_A, edn_urnd_o)
 
 endmodule