transcoding: Allow service read/write to app data.

bug: 154734285
bug: 158240484
Test: MediaTranscodeManager unit test
Change-Id: I6771a4a97531da3d980749b77fa8c6deca2c5bb3
diff --git a/private/mediatranscoding.te b/private/mediatranscoding.te
index 0163f13..bac752f 100644
--- a/private/mediatranscoding.te
+++ b/private/mediatranscoding.te
@@ -30,6 +30,7 @@
 allow mediatranscoding sdcardfs:file { getattr read write };
 allow mediatranscoding media_rw_data_file:file { getattr read write };
 allow mediatranscoding apk_data_file:file { getattr read };
+allow mediatranscoding app_data_file:file { getattr read write };
 allow mediatranscoding shell_data_file:file { getattr read write };
 
 # mediatranscoding should never execute any executable without a