Transcoder: Increase unit test timeout

MediaTranscoderTests have been flaky on CuttleFish
and it looks like it is due to tests timing out.
This CL increases the unit test's timeout to 10m.

Bug: 178655729
Test: Build + verifying presubmit
Change-Id: Id2ea98a1c35763bcad877a68b477c815d443e554
diff --git a/media/libmediatranscoding/transcoder/tests/AndroidTestTemplate.xml b/media/libmediatranscoding/transcoder/tests/AndroidTestTemplate.xml
index 6d781cd..e40a507 100644
--- a/media/libmediatranscoding/transcoder/tests/AndroidTestTemplate.xml
+++ b/media/libmediatranscoding/transcoder/tests/AndroidTestTemplate.xml
@@ -24,6 +24,7 @@
     <test class="com.android.tradefed.testtype.GTest" >
         <option name="native-test-device-path" value="/data/local/tmp" />
         <option name="module-name" value="{MODULE}" />
+        <option name="native-test-timeout" value="10m" />
     </test>
 </configuration>