Add a policy version.

Bug: 8841348
Change-Id: I83497c9b5346ba3b35e4e288190fc217a26be505
diff --git a/policy.version b/policy.version
new file mode 100644
index 0000000..45a4fb7
--- /dev/null
+++ b/policy.version
@@ -0,0 +1 @@
+8