Rename corresponding libaom_av1_encoder_if_supported java buildtargets.

This is in preparation to introduce new java buildtargets that will use the `libaom_av1_encoder` buildtarget instead.

bug: webrtc:13573
Change-Id: I23e80653943ede576657acc17bcc5602cb0a4d5d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/254540
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36171}

sdk/android/api/org/webrtc/LibaomAv1EncoderIfSupported.java

@@ -0,0 +1,27 @@
+/*
+ *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.webrtc;
+
+public class LibaomAv1EncoderIfSupported extends WrappedNativeVideoEncoder {
+  @Override
+  public long createNativeVideoEncoder() {
+    return nativeCreateEncoder();
+  }
+
+  static native long nativeCreateEncoder();
+
+  @Override
+  public boolean isHardwareEncoder() {
+    return false;
+  }
+
+  static native boolean nativeIsSupported();
+}