[video] VP9 encoder is not required as of android O

Bug: 33090965
Change-Id: Id3e12cac65af62f2108403a7da36e10a3536ee87
diff --git a/tests/expectations/knownfailures.txt b/tests/expectations/knownfailures.txt
index 6bb3421..e4ca5af 100644
--- a/tests/expectations/knownfailures.txt
+++ b/tests/expectations/knownfailures.txt
@@ -240,6 +240,16 @@
    bug: 23827982
 },
 {
+   description: "VP9 encoder is not a standard requirement of android as of O.",
+   names: [
+     "android.media.cts.VideoEncoderDecoderTest#testVp9Goog0Perf0320x0180",
+     "android.media.cts.VideoEncoderDecoderTest#testVp9Goog0Perf0640x0360",
+     "android.media.cts.VideoEncoderDecoderTest#testVp9Goog0Perf1280x0720",
+     "android.media.cts.VideoEncoderDecoderTest#testVp9Goog0Perf1920x1080"
+   ],
+   bug: 33090965
+},
+{
   description: "protected broadcast not working",
   names: [
    "android.permission2.cts.ProtectedBroadcastsTest#testSendProtectedBroadcasts"