Add OWNERS and fix version string

* Fix METADATA version string, which must be d1.d2.d3
  to work with external_updater.

Test: make
Change-Id: I86d4e6a6878915cc538d7ba1f183e1828e4c189d
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..46fc303
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+include platform/prebuilts/rust:/OWNERS