Move microdroid sepolicy to system/sepolicy

Bug: 190511750
Test: boot microdroid
Change-Id: I4aa4a56e9be5103d70469c3508110a973f3e4f12
diff --git a/microdroid/system/private/net.te b/microdroid/system/private/net.te
new file mode 100644
index 0000000..1b2fd41
--- /dev/null
+++ b/microdroid/system/private/net.te
@@ -0,0 +1,16 @@
+## Network types
+type node, node_type;
+type netif, netif_type;
+type port, port_type;
+
+###
+### Domain with network access
+###
+
+allow netdomain self:tcp_socket create_stream_socket_perms;
+allow netdomain self:{ icmp_socket udp_socket rawip_socket } create_socket_perms;
+
+allow netdomain port_type:tcp_socket name_connect;
+allow netdomain node_type:{ icmp_socket rawip_socket tcp_socket udp_socket } node_bind;
+allow netdomain port_type:udp_socket name_bind;
+allow netdomain port_type:tcp_socket name_bind;