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/certificate/phosphor-certificate-manager_%.bbappend b/meta-ibm/recipes-phosphor/certificate/phosphor-certificate-manager_%.bbappend
index ee6b189..ab4f048 100644
--- a/meta-ibm/recipes-phosphor/certificate/phosphor-certificate-manager_%.bbappend
+++ b/meta-ibm/recipes-phosphor/certificate/phosphor-certificate-manager_%.bbappend
@@ -1,2 +1,2 @@
-PACKAGECONFIG_append_p10bmc = " ibm-hypervisor-cert"
-PACKAGECONFIG_append_witherspoon-tacoma = " ibm-hypervisor-cert"
+PACKAGECONFIG:append:p10bmc = " ibm-hypervisor-cert"
+PACKAGECONFIG:append:witherspoon-tacoma = " ibm-hypervisor-cert"