Allow dumpstate to create tmpfs files

dumpstate needs to be able to create tmpfs files for it's upcoming use
of memfd_create.

Test: Generate bugreport
Change-Id: I4ce19635d9b76929b05d85bdba89340e5d5399d1
diff --git a/private/dumpstate.te b/private/dumpstate.te
index 4fad585..ed3e996 100644
--- a/private/dumpstate.te
+++ b/private/dumpstate.te
@@ -6,6 +6,10 @@
 # Execute and transition to the vdc domain
 domain_auto_trans(dumpstate, vdc_exec, vdc)
 
+# Create tmpfs files for using memfd descriptors to get output from child
+# processes.
+tmpfs_domain(dumpstate)
+
 # Acquire advisory lock on /system/etc/xtables.lock from ip[6]tables
 allow dumpstate system_file:file lock;