Move microdroid sepolicy to system/sepolicy

Bug: 190511750
Test: boot microdroid
Change-Id: I4aa4a56e9be5103d70469c3508110a973f3e4f12
diff --git a/microdroid/system/private/property.te b/microdroid/system/private/property.te
new file mode 100644
index 0000000..d3d413e
--- /dev/null
+++ b/microdroid/system/private/property.te
@@ -0,0 +1,16 @@
+###
+### Neverallow rules
+###
+
+neverallow {
+  domain
+  -init
+  -microdroid_manager
+} vmsecret_keymint_prop:property_service set;
+
+neverallow {
+  domain
+  -init
+  -microdroid_manager
+  -hal_keymint_server
+} vmsecret_keymint_prop:file no_rw_file_perms;