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/fans/phosphor-fan-control-events-config.bbappend b/meta-ibm/recipes-phosphor/fans/phosphor-fan-control-events-config.bbappend
index 8f2097c..9accc57 100644
--- a/meta-ibm/recipes-phosphor/fans/phosphor-fan-control-events-config.bbappend
+++ b/meta-ibm/recipes-phosphor/fans/phosphor-fan-control-events-config.bbappend
@@ -1 +1 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
+FILESEXTRAPATHS:prepend := "${THISDIR}/${BPN}:"