Allow calling SoftwareVideoDecoderFactory#createDecoder(String).

Previously, this would crash with UnsupportedOperationException. Allows
still calling this while the method is deprecated.

Bug: webrtc:9536, webrtc:7925
Change-Id: I7b88cecca7a4e6f505c7211cf2eb576c394973f8
Reviewed-on: https://webrtc-review.googlesource.com/89381
Reviewed-by: Paulina Hensman <phensman@webrtc.org>
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24025}

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

@@ -16,6 +16,13 @@ import java.util.List;
 import javax.annotation.Nullable;
 
 public class SoftwareVideoDecoderFactory implements VideoDecoderFactory {
+  @Deprecated
+  @Nullable
+  @Override
+  public VideoDecoder createDecoder(String codecType) {
+    return createDecoder(new VideoCodecInfo(codecType, new HashMap<>()));
+  }
+
   @Nullable
   @Override
   public VideoDecoder createDecoder(VideoCodecInfo codecType) {