allow mediaprovider to use media extractor

When extraction exif info, certain file formats may requires
parsing the container. Allow mediaprovider to use extractor
to do the parsing.

bug: 73978990
Test: manually test the scenario in b/73978990 and verify
      the Exif is extracted correctly.

Change-Id: I1cd46d793ebc9c38b816a3b63f361967e551d046
(cherry picked from commit 8e3fef3d)

private/mediaprovider.te

@@ -23,6 +23,7 @@ dontaudit mediaprovider cache_recovery_file:dir getattr;
 allow mediaprovider app_api_service:service_manager find;
 allow mediaprovider audioserver_service:service_manager find;
 allow mediaprovider drmserver_service:service_manager find;
+allow mediaprovider mediaextractor_service:service_manager find;
 allow mediaprovider mediaserver_service:service_manager find;
 
 # Allow MediaProvider to read/write cached ringtones (opened by system).