Disable runtime image tests while investigating b/268225365.

Bug: 268225365
Bug: 260557058
Change-Id: I17d3225a168c06b9ad67e58b887d86094e4c267b
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 44ba3e9..2ff7f19 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -1556,5 +1556,10 @@
         "env_vars": {"ART_TEST_DEBUG_GC": "true"},
         "bug": "b/264844668",
         "description": ["Test timing out on debug gc."]
+    },
+    {
+        "tests": ["845-data-image", "846-multidex-data-image"],
+        "bug": "b/260557058",
+        "description": ["Disabled while investigating b/268225365."]
     }
 ]