Added software h264 video encoder for emulator/sdk build

o related-to-bug: 6383440

Change-Id: I0abf595cd1cabd0be6d05bc9250c90300149f16b
diff --git a/tools/emulator/system/camera/media_codecs.xml b/tools/emulator/system/camera/media_codecs.xml
index 53f27c1..e25fa2b 100644
--- a/tools/emulator/system/camera/media_codecs.xml
+++ b/tools/emulator/system/camera/media_codecs.xml
@@ -95,5 +95,6 @@
         <MediaCodec name="OMX.google.amrnb.encoder" type="audio/3gpp" />
         <MediaCodec name="OMX.google.amrwb.encoder" type="audio/amr-wb" />
         <MediaCodec name="OMX.google.aac.encoder" type="audio/mp4a-latm" />
+        <MediaCodec name="OMX.google.h264.encoder" type="video/avc" />
     </Encoders>
 </MediaCodecs>