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/services/mediatranscoding/tests/README.txt b/services/mediatranscoding/tests/README.txt
index 5ee0296..cde465e 100644
--- a/services/mediatranscoding/tests/README.txt
+++ b/services/mediatranscoding/tests/README.txt
@@ -5,4 +5,4 @@
 	Tests media transcoding service with real transcoder. Uses the same test assets
 	as the MediaTranscoder unit tests. Before running the test, please make sure
 	to push the test assets to /sdcard:
-	adb push $TOP/frameworks/av/media/libmediatranscoding/transcoder/tests/assets /data/local/tmp/TranscoderTestAssets
\ No newline at end of file
+	adb push $TOP/frameworks/av/media/libmediatranscoding/tests/assets /data/local/tmp/TranscodingTestAssets