Disable test 648 on speed-profile.

bug:33650497
Test: test-art-host
Change-Id: Iea709bf6611af3c66af32852ab19e8dad485d248
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 3fdd9b3..7c17ed0 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -668,7 +668,7 @@
     },
     {
         "tests": "648-many-direct-methods",
-        "variant": "optimizing",
+        "variant": "optimizing | speed-profile",
         "description": "Test disabled with AOT because of dex2oatd timeouts.",
         "bug": "b/33650497"
     }