meta-openpower: prep for new override syntax

Change-Id: I5ca16c6fa7bc616bfa9bc41c4f86d32fd92b0287
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/meta-openpower/classes/openpower-software-manager-mmc.bbclass b/meta-openpower/classes/openpower-software-manager-mmc.bbclass
index 38ae631..afbee1a 100644
--- a/meta-openpower/classes/openpower-software-manager-mmc.bbclass
+++ b/meta-openpower/classes/openpower-software-manager-mmc.bbclass
@@ -1,6 +1,6 @@
-PACKAGECONFIG_append = " mmc_layout"
+PACKAGECONFIG:append = " mmc_layout"
 
-SYSTEMD_SERVICE_${PN} += " \
+SYSTEMD_SERVICE:${PN} += " \
     obmc-flash-bios-init.service \
     obmc-flash-bios-patch.service \
     openpower-process-host-firmware.service \