meta-ibm: prep for new override syntax

Change-Id: I9116ed7260e369136acb39eec15075db2d4dbeba
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/meta-ibm/recipes-phosphor/dbus/snmp-policy.bb b/meta-ibm/recipes-phosphor/dbus/snmp-policy.bb
index 500c674..94fce40 100644
--- a/meta-ibm/recipes-phosphor/dbus/snmp-policy.bb
+++ b/meta-ibm/recipes-phosphor/dbus/snmp-policy.bb
@@ -6,7 +6,7 @@
 inherit allarch
 inherit phosphor-dbus-monitor
 
-FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
+FILESEXTRAPATHS:prepend := "${THISDIR}/${BPN}:"
 
 SRC_URI += "file://snmp-config.yaml"