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/watchdog/phosphor-watchdog_%.bbappend b/meta-ibm/recipes-phosphor/watchdog/phosphor-watchdog_%.bbappend
index 0d9704f..7d90446 100644
--- a/meta-ibm/recipes-phosphor/watchdog/phosphor-watchdog_%.bbappend
+++ b/meta-ibm/recipes-phosphor/watchdog/phosphor-watchdog_%.bbappend
@@ -1,4 +1,4 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
 
 # utilize a 600s default timer config for p10bmc
-SYSTEMD_ENVIRONMENT_FILE_${PN}_append_p10bmc = " obmc/watchdog/poweron"
+SYSTEMD_ENVIRONMENT_FILE_${PN}:append:p10bmc = " obmc/watchdog/poweron"