Disable test on RI.

It uses a prebuilt classes.dex.

Test: 836-32768classes
Change-Id: I3a55373047fc317df2a55ede463438848603d711
diff --git a/test/knownfailures.json b/test/knownfailures.json
index ff6c247..a239e53 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -1168,6 +1168,7 @@
                   "831-unverified-bcp",
                   "831-unresolved-field",
                   "833-background-verification",
+                  "836-32768classes",
                   "999-redefine-hiddenapi",
                   "1000-non-moving-space-stress",
                   "1001-app-image-regions",