Update xvm-prodconfig to version 1.1.63

Requested by quentin/root@ATHENA.MIT.EDU

diff --git a/xvm-prodconfig b/xvm-prodconfig
index d082fa5..cf354e0 160000 (submodule)
--- a/xvm-prodconfig
+++ b/xvm-prodconfig
@@ -1 +1 @@
-Subproject commit d082fa5de64cd0c5032959334486a3db51c7a2ae
+Subproject commit cf354e0db3f35d5539ee1816f2b5e5c7a6b9a7ff