Allow ephemeral apps to find media.drm

Bug: 62102558
Test: see b/62102558
Change-Id: If80d1270bcf6835e6d1a78e2176c3e139cebd174

private/ephemeral_app.te

@@ -26,6 +26,7 @@ allow ephemeral_app mediaserver_service:service_manager find;
 allow ephemeral_app mediaextractor_service:service_manager find;
 allow ephemeral_app mediacodec_service:service_manager find;
 allow ephemeral_app mediametrics_service:service_manager find;
+allow ephemeral_app mediadrmserver_service:service_manager find;
 allow ephemeral_app mediacasserver_service:service_manager find;
 allow ephemeral_app surfaceflinger_service:service_manager find;
 allow ephemeral_app radio_service:service_manager find;