Add microdroid specific sepolicy

Microdroid will have a separate sepolicy, apart from the core policy.
This is the first step; For now it's a simple copy of system/sepolicy.
For the future work, it will be stripped.

Bug: 189165759
Test: boot microdroid and see selinux enforced
Change-Id: I2fee39f7231560b49c93bd5e8d0feeffada40938
diff --git a/microdroid/sepolicy/system/private/auditctl.te b/microdroid/sepolicy/system/private/auditctl.te
new file mode 100644
index 0000000..f634d3d
--- /dev/null
+++ b/microdroid/sepolicy/system/private/auditctl.te
@@ -0,0 +1,18 @@
+#
+# /system/bin/auditctl executed for logd
+#
+# Performs maintenance of the kernel auditing system, including
+# setting rate limits on SELinux denials.
+#
+
+type auditctl, domain, coredomain;
+type auditctl_exec, file_type, system_file_type, exec_type;
+
+# Uncomment the line below to put this domain into permissive
+# mode. This helps speed SELinux policy development.
+# userdebug_or_eng(`permissive auditctl;')
+
+init_daemon_domain(auditctl)
+
+allow auditctl self:global_capability_class_set audit_control;
+allow auditctl self:netlink_audit_socket { create_socket_perms_no_ioctl nlmsg_write };