Disable input vdex tests for cdex

Since aog/588646, these are correctly aborting.

Test: test/testrunner/testrunner.py -j8 --optimizing --verbose --host --debug --cdex-fast
Bug: 63756964
Change-Id: Ib59e3b9820e2ad42d4636f9efec3b20257272fc7
diff --git a/test/knownfailures.json b/test/knownfailures.json
index b38f914..b39d607 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -648,6 +648,13 @@
         "bug": "b/64683522"
     },
     {
+        "tests": ["628-vdex",
+                  "629-vdex-speed",
+                  "634-vdex-duplicate"],
+        "variant": "cdex-fast",
+        "description": ["Tests that depend on input-vdex are not supported with compact dex"]
+    },
+    {
         "tests": "661-oat-writer-layout",
         "variant": "interp-ac | interpreter | jit | no-dex2oat | no-prebuild | no-image | trace | redefine-stress | jvmti-stress",
         "description": ["Test is designed to only check --compiler-filter=speed"]