Update xvm-prodconfig to version 1.1.48

Requested by dvorak42/root@ATHENA.MIT.EDU

diff --git a/xvm-prodconfig b/xvm-prodconfig
index 7694ef6..66a9e2e 160000 (submodule)
--- a/xvm-prodconfig
+++ b/xvm-prodconfig
@@ -1 +1 @@
-Subproject commit 7694ef6222d1b016c25c3ad0b7e2e2d29f698197
+Subproject commit 66a9e2e7541a02ba0f49114dccd9cbeff13d86f5