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/ipmi/phosphor-ipmi-net_%.bbappend b/meta-ibm/recipes-phosphor/ipmi/phosphor-ipmi-net_%.bbappend
index c847c05..a157e0d 100644
--- a/meta-ibm/recipes-phosphor/ipmi/phosphor-ipmi-net_%.bbappend
+++ b/meta-ibm/recipes-phosphor/ipmi/phosphor-ipmi-net_%.bbappend
@@ -1,5 +1,5 @@
-ALT_RMCPP_IFACE_mihawk  = "eth1"
-SYSTEMD_SERVICE_${PN}_append_mihawk += " \
+ALT_RMCPP_IFACE:mihawk  = "eth1"
+SYSTEMD_SERVICE:${PN}:append:mihawk += " \
     ${PN}@${ALT_RMCPP_IFACE}.service \
     ${PN}@${ALT_RMCPP_IFACE}.socket \
     "