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/dbus/phosphor-dbus-monitor-config.bb b/meta-phosphor/recipes-phosphor/dbus/phosphor-dbus-monitor-config.bb
index d1de054..dddf9c0 100644
--- a/meta-phosphor/recipes-phosphor/dbus/phosphor-dbus-monitor-config.bb
+++ b/meta-phosphor/recipes-phosphor/dbus/phosphor-dbus-monitor-config.bb
@@ -19,4 +19,4 @@
     mkdir -p ${D}${config_dir}
 }
 
-FILES_${PN} += "${config_dir}"
+FILES:${PN} += "${config_dir}"