Update xvm-prodconfig to version 1.1.59

Requested by mitchb/root@ATHENA.MIT.EDU

diff --git a/xvm-prodconfig b/xvm-prodconfig
index 62d3e1d..eaf6300 160000 (submodule)
--- a/xvm-prodconfig
+++ b/xvm-prodconfig
@@ -1 +1 @@
-Subproject commit 62d3e1dcaace5cb86a5226428b52e3fb6e27e76b
+Subproject commit eaf6300a7d9842ca23ae1639b198a9e2a5ce43bd