meta-openpower: prep for new override syntax

Change-Id: I5ca16c6fa7bc616bfa9bc41c4f86d32fd92b0287
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/meta-openpower/recipes-bsp/ecmd/croserver_git.bb b/meta-openpower/recipes-bsp/ecmd/croserver_git.bb
index e1aa88e..cdd244e 100644
--- a/meta-openpower/recipes-bsp/ecmd/croserver_git.bb
+++ b/meta-openpower/recipes-bsp/ecmd/croserver_git.bb
@@ -33,4 +33,4 @@
     install -m 0644 ${WORKDIR}/croserver.service ${D}${systemd_system_unitdir}/
 }
 
-FILES_${PN} += "${systemd_system_unitdir}/croserver.service"
+FILES:${PN} += "${systemd_system_unitdir}/croserver.service"