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/fans/phosphor-fan-control-zone-conditions-config.bb b/meta-phosphor/recipes-phosphor/fans/phosphor-fan-control-zone-conditions-config.bb
index 3191753..8d040e1 100644
--- a/meta-phosphor/recipes-phosphor/fans/phosphor-fan-control-zone-conditions-config.bb
+++ b/meta-phosphor/recipes-phosphor/fans/phosphor-fan-control-zone-conditions-config.bb
@@ -14,4 +14,4 @@
     install -D zone_conditions.yaml ${D}${control_datadir}/zone_conditions.yaml
 }
 
-FILES_${PN} += "${control_datadir}/zone_conditions.yaml"
+FILES:${PN} += "${control_datadir}/zone_conditions.yaml"