update JavaAudioDeviceModule.Builder.build() to return JavaAudioDeviceModule

Bug: None
Change-Id: Iff43debf677ed4a006a8edabde9455566f5cb159
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/182580
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Bin Zhu <ricebin@google.com>
Cr-Commit-Position: refs/heads/master@{#32001}

sdk/android/api/org/webrtc/audio/JavaAudioDeviceModule.java

@@ -190,7 +190,7 @@ public class JavaAudioDeviceModule implements AudioDeviceModule {
      * Construct an AudioDeviceModule based on the supplied arguments. The caller takes ownership
      * and is responsible for calling release().
      */
-    public AudioDeviceModule createAudioDeviceModule() {
+    public JavaAudioDeviceModule createAudioDeviceModule() {
       Logging.d(TAG, "createAudioDeviceModule");
       if (useHardwareNoiseSuppressor) {
         Logging.d(TAG, "HW NS will be used.");