allow mediatranscoding service to be stack dumped

bug: 170975812
Change-Id: Id73aaf5343efa3c67470e51f63a663a1684e7bf6
diff --git a/private/dumpstate.te b/private/dumpstate.te
index 0eff540..bb707c3 100644
--- a/private/dumpstate.te
+++ b/private/dumpstate.te
@@ -36,6 +36,7 @@
 
 # Signal native processes to dump their stack.
 allow dumpstate {
+  mediatranscoding
   statsd
   netd
 }:process signal;