mboxd: disable virtual pnor code

Disable virtual pnor code via a compiler flag. This should have been
enabled when all of the virtual pnor code is in.

Resolves openbmc/openbmc#1875.

Change-Id: Id99779cd1c80fbc9598b78eae16ed109971658c5
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/common/recipes-phosphor/mboxd/mboxd.bb b/common/recipes-phosphor/mboxd/mboxd.bb
index e961593..52af132 100644
--- a/common/recipes-phosphor/mboxd/mboxd.bb
+++ b/common/recipes-phosphor/mboxd/mboxd.bb
@@ -44,3 +44,7 @@
 SYSTEMD_SERVICE_${PN} += "mboxd.service"
 SYSTEMD_SERVICE_${PN} += "mboxd-reload@.service"
 SYSTEMD_LINK_${PN} += "${@compose_list(d, 'FMT', 'OBMC_CHASSIS_INSTANCES')}"
+
+EXTRA_OECONF = " \
+        enable_virtual_pnor=no \
+        "