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/flash/openpower-software-manager_%.bbappend b/meta-ibm/recipes-phosphor/flash/openpower-software-manager_%.bbappend
index 6c1f275..2d9c096 100644
--- a/meta-ibm/recipes-phosphor/flash/openpower-software-manager_%.bbappend
+++ b/meta-ibm/recipes-phosphor/flash/openpower-software-manager_%.bbappend
@@ -1,2 +1,2 @@
-PACKAGECONFIG_append_ibm-ac-server = " verify_pnor_signature"
-PACKAGECONFIG_append_mihawk = " verify_pnor_signature"
+PACKAGECONFIG:append:ibm-ac-server = " verify_pnor_signature"
+PACKAGECONFIG:append:mihawk = " verify_pnor_signature"