Allow system_server to talk to netlink directly.

This is needed for http://ag/512212 to work.

Bug: 15409819
Change-Id: If91fc6891d7ce04060362c6cde8c57462394c4e8

system_server.te

@@ -70,6 +70,9 @@ allow system_server self:netlink_kobject_uevent_socket create_socket_perms;
 # Use generic netlink sockets.
 allow system_server self:netlink_socket create_socket_perms;
 
+# Set and get routes directly via netlink.
+allow system_server self:netlink_route_socket nlmsg_write;
+
 # Kill apps.
 allow system_server appdomain:process { sigkill signal };