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-fan-config-mrw.bb b/meta-phosphor/recipes-phosphor/fans/phosphor-fan-control-fan-config-mrw.bb
index 38a424b..428c212 100644
--- a/meta-phosphor/recipes-phosphor/fans/phosphor-fan-control-fan-config-mrw.bb
+++ b/meta-phosphor/recipes-phosphor/fans/phosphor-fan-control-fan-config-mrw.bb
@@ -21,4 +21,4 @@
         install -D fans.yaml ${D}${control_datadir}/fans.yaml
 }
 
-FILES_${PN} += "${control_datadir}/fans.yaml"
+FILES:${PN} += "${control_datadir}/fans.yaml"