ibex: the revoker IRQ is edge-triggered

sdk/boards/ibex-safe-simulator.json

diff --git a/sdk/boards/ibex-safe-simulator.json b/sdk/boards/ibex-safe-simulator.json
index 87ac417..d959cb1 100644
--- a/sdk/boards/ibex-safe-simulator.json
+++ b/sdk/boards/ibex-safe-simulator.json
@@ -32,7 +32,8 @@
         {
             "name": "RevokerInterrupt",
             "number": 1,
-            "priority": 2
+            "priority": 2,
+            "edge_triggered": true
         }
     ],
     "defines" : [