transcoding: Add more test assets for testing.

Also move the test file used by transocder to another folder in order
to be reused by both transcoding service and transcoder for testing.

Bug: 145628554
Bug: 154734285
Test: Unit test

Change-Id: I61e16ab5deba70da71f4d23fc87157be2f3b3bca
diff --git a/media/libmediatranscoding/transcoder/tests/AndroidTestTemplate.xml b/media/libmediatranscoding/transcoder/tests/AndroidTestTemplate.xml
index 23d1bab..a9a7e2e 100644
--- a/media/libmediatranscoding/transcoder/tests/AndroidTestTemplate.xml
+++ b/media/libmediatranscoding/transcoder/tests/AndroidTestTemplate.xml
@@ -19,7 +19,7 @@
         <option name="cleanup" value="false" />
         <option name="push-file"
             key="assets"
-            value="/data/local/tmp/TranscoderTestAssets" />
+            value="/data/local/tmp/TranscodingTestAssets" />
     </target_preparer>
 
     <test class="com.android.tradefed.testtype.GTest" >