Switch to term-on-error for mfg mode errors

Change Hostboot behavior to do a regular terminate in manufacturing
mode instead of doing infinite loop since we have a BMC codestack
that supports not rebooting.
diff --git a/openpower/configs/hostboot/witherspoon.config b/openpower/configs/hostboot/witherspoon.config
index 173cb63..0bcf28c 100755
--- a/openpower/configs/hostboot/witherspoon.config
+++ b/openpower/configs/hostboot/witherspoon.config
@@ -71,3 +71,6 @@
 unset CONSOLE_OUTPUT_TRACE
 set CONSOLE_OUTPUT_FFDCDISPLAY
 
+# Terminate Hostboot when errors occur in manufacturing mode
+#   (relies on BMC to not trigger reboot)
+unset HANG_ON_MFG_SRC_TERM