allow binderservice domains to write to a fifo file

Bug: 27511071
Change-Id: I737aa9daac6c78846fe375300c3338e401d733ac

binderservicedomain.te

@@ -3,6 +3,7 @@
 # Allow dumpstate to collect information from binder services
 allow binderservicedomain dumpstate:fd use;
 allow binderservicedomain dumpstate:unix_stream_socket { read write getopt getattr };
+allow binderservicedomain dumpstate:fifo_file  { getattr write };
 allow binderservicedomain shell_data_file:file { getattr write };
 
 # Allow dumpsys to work from adb shell or the serial console