meta-ibm: prep for new override syntax

Change-Id: I9116ed7260e369136acb39eec15075db2d4dbeba
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/meta-ibm/meta-palmetto/recipes-kernel/linux/linux-aspeed_%.bbappend b/meta-ibm/meta-palmetto/recipes-kernel/linux/linux-aspeed_%.bbappend
index 6cdb951..62a07f4 100644
--- a/meta-ibm/meta-palmetto/recipes-kernel/linux/linux-aspeed_%.bbappend
+++ b/meta-ibm/meta-palmetto/recipes-kernel/linux/linux-aspeed_%.bbappend
@@ -1,2 +1,2 @@
-FILESEXTRAPATHS_prepend_palmetto := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS:prepend:palmetto := "${THISDIR}/${PN}:"
 SRC_URI += "file://palmetto.cfg"