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/inventory/phosphor-inventory-manager-assettag.bb b/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager-assettag.bb
index 2cba64e..317269f 100644
--- a/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager-assettag.bb
+++ b/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager-assettag.bb
@@ -15,4 +15,4 @@
         install -D assettag.yaml ${D}${base_datadir}/events.d/assettag.yaml
 }
 
-FILES_${PN} += "${base_datadir}/events.d/assettag.yaml"
+FILES:${PN} += "${base_datadir}/events.d/assettag.yaml"