Fix the mime type for software h263 decoder in media_codecs.xml file

Change-Id: I07045e0fb3e4565b7e966aaf385f519ef4a6ec52
diff --git a/media_codecs.xml b/media_codecs.xml
index eea5451..9e460e9 100644
--- a/media_codecs.xml
+++ b/media_codecs.xml
@@ -66,7 +66,7 @@
         </MediaCodec>
         <MediaCodec name="OMX.google.vpx.decoder" type="video/x-vnd.on2.vp8" />
         <MediaCodec name="OMX.google.h264.decoder" type="video/avc" />
-        <MediaCodec name="OMX.google.mpeg4.decoder" type="video/mpeg4" />
+        <MediaCodec name="OMX.google.h263.decoder" type="video/3gpp" />
         <MediaCodec name="OMX.google.mpeg4.decoder" type="video/mp4v-es" />
     </Decoders>
 </MediaCodecs>