meta-phosphor: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I588025b614416c43aa2d053765ab53bacf890cb5
diff --git a/meta-phosphor/recipes-phosphor/system/obmc-control-bmc_git.bb b/meta-phosphor/recipes-phosphor/system/obmc-control-bmc_git.bb
index 7044f79..70dac0a 100644
--- a/meta-phosphor/recipes-phosphor/system/obmc-control-bmc_git.bb
+++ b/meta-phosphor/recipes-phosphor/system/obmc-control-bmc_git.bb
@@ -11,4 +11,4 @@
 SKELETON_DIR = "bmcctl"
 
 FMT = "org.openbmc.control.Bmc@{0}.service"
-DBUS_SERVICE_${PN} += "${@compose_list(d, 'FMT', 'OBMC_BMC_INSTANCES')}"
+DBUS_SERVICE:${PN} += "${@compose_list(d, 'FMT', 'OBMC_BMC_INSTANCES')}"