meta-openpower: prep for new override syntax

Change-Id: I5ca16c6fa7bc616bfa9bc41c4f86d32fd92b0287
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/meta-openpower/recipes-phosphor/packagegroups/packagegroup-obmc-ipmid-providers.bbappend b/meta-openpower/recipes-phosphor/packagegroups/packagegroup-obmc-ipmid-providers.bbappend
index 09b4200..a2f0006 100644
--- a/meta-openpower/recipes-phosphor/packagegroups/packagegroup-obmc-ipmid-providers.bbappend
+++ b/meta-openpower/recipes-phosphor/packagegroups/packagegroup-obmc-ipmid-providers.bbappend
@@ -2,6 +2,6 @@
 # providers with whitelists that should not be ignored to
 # conf/machine/openpower.inc
 
-VIRTUAL-RUNTIME_phosphor-ipmi-providers_append_df-openpower = " \
+VIRTUAL-RUNTIME_phosphor-ipmi-providers:append:df-openpower = " \
     openpower-host-ipmi-flash \
 "