Disable 660-clinit for no-dex2oat

Test: art/test.py --host -j
Change-Id: I164726f9e9c435cfa81077fcd5e4607a675c7a41
diff --git a/test/knownfailures.json b/test/knownfailures.json
index ffcd522..304b760 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -715,7 +715,7 @@
     },
     {
         "tests": "660-clinit",
-        "variant": "no-image",
-        "description": "Tests <clinit> for app images, which --no-image doesn't do"
+        "variant": "no-image | no-dex2oat",
+        "description": "Tests <clinit> for app images, which --no-image and --no-dex2oat do not create"
     }
 ]