Move microdroid sepolicy to system/sepolicy

Bug: 190511750
Test: boot microdroid
Change-Id: I4aa4a56e9be5103d70469c3508110a973f3e4f12
diff --git a/microdroid/system/private/tombstoned.te b/microdroid/system/private/tombstoned.te
new file mode 100644
index 0000000..2567a23
--- /dev/null
+++ b/microdroid/system/private/tombstoned.te
@@ -0,0 +1,12 @@
+typeattribute tombstoned coredomain;
+
+init_daemon_domain(tombstoned)
+
+# Write to arbitrary pipes given to us.
+allow tombstoned domain:fd use;
+allow tombstoned domain:fifo_file write;
+
+allow tombstoned domain:dir r_dir_perms;
+allow tombstoned domain:file r_file_perms;
+allow tombstoned tombstone_data_file:dir rw_dir_perms;
+allow tombstoned tombstone_data_file:file { create_file_perms link };