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/PassthroughTrackTranscoderTests.cpp b/media/libmediatranscoding/transcoder/tests/PassthroughTrackTranscoderTests.cpp
index 316793a..b79f58c 100644
--- a/media/libmediatranscoding/transcoder/tests/PassthroughTrackTranscoderTests.cpp
+++ b/media/libmediatranscoding/transcoder/tests/PassthroughTrackTranscoderTests.cpp
@@ -41,7 +41,7 @@
 
     void initSourceAndExtractor() {
         const char* sourcePath =
-                "/data/local/tmp/TranscoderTestAssets/cubicle_avc_480x240_aac_24KHz.mp4";
+                "/data/local/tmp/TranscodingTestAssets/cubicle_avc_480x240_aac_24KHz.mp4";
 
         mExtractor = AMediaExtractor_new();
         ASSERT_NE(mExtractor, nullptr);