meta-openpower: phosphor-software-manager add distro suffix

For phosphor-software-manager, add df-openpower distro suffix to avoid
poisoning other machines or distros using this layer.  This is
effectively bringing this recipe up to the state of other openpower
recipes.

Change-Id: I55aacb7f335680397fd7488fa579c04c1b31e930
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/recipes-phosphor/flash/phosphor-software-manager.bbappend b/recipes-phosphor/flash/phosphor-software-manager.bbappend
index c1799f1..e873e99 100644
--- a/recipes-phosphor/flash/phosphor-software-manager.bbappend
+++ b/recipes-phosphor/flash/phosphor-software-manager.bbappend
@@ -1,4 +1,4 @@
-FILESEXTRAPATHS_append := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS_append_df-openpower := "${THISDIR}/${PN}:"
 
-SYSTEMD_OVERRIDE_${PN}-updater += \
-    "software-bmc-updater.conf:xyz.openbmc_project.Software.BMC.Updater.service.d/software-bmc-updater.conf"
+SYSTEMD_OVERRIDE_${PN}-updater_append_df-openpower = \
+    " software-bmc-updater.conf:xyz.openbmc_project.Software.BMC.Updater.service.d/software-bmc-updater.conf"