Fix SELinux denials for protected content playback

bug: 30087072
bug: 29937024
Change-Id: I8bf3032b8455556ff5332f538f43aeb514d3b290

mediadrmserver.te

@@ -49,6 +49,7 @@ allow mediadrmserver tee:unix_stream_socket connectto;
 allow mediadrmserver mediadrmserver_service:service_manager { add find };
 allow mediadrmserver mediaserver_service:service_manager { add find };
 allow mediadrmserver processinfo_service:service_manager find;
+allow mediadrmserver surfaceflinger_service:service_manager find;
 
 # only allow unprivileged socket ioctl commands
 allowxperm mediadrmserver self:{ rawip_socket tcp_socket udp_socket }