modularize dmd

Bug: 190331463
Test: build ROM and make sure dmd is launched
Change-Id: If1e51b6bc100e870a15a40f5e0d93a75fe68bac3
diff --git a/modem/user/property.te b/modem/user/property.te
new file mode 100644
index 0000000..353b1c8
--- /dev/null
+++ b/modem/user/property.te
@@ -0,0 +1,3 @@
+vendor_internal_prop(vendor_diag_prop)
+vendor_internal_prop(vendor_slog_prop)
+vendor_internal_prop(vendor_modem_prop)