sepolicy: Label our updater

Change-Id: I72a6aa5d213673b478ee8a6c26a1e3b7e772355d
diff --git a/common/private/seapp_contexts b/common/private/seapp_contexts
new file mode 100644
index 0000000..c5f6aba
--- /dev/null
+++ b/common/private/seapp_contexts
@@ -0,0 +1 @@
+user=_app isPrivApp=true seinfo=platform name=org.leafos.updater domain=updater_app type=app_data_file levelFrom=user