systemd: avoid {BUSNAME}

The idiomatic way to replace tokens is with autoconf or with the meson
configure_file directive, so avoid relying on bitbake recipes to replace
tokens.

In this case, don't bother with a replaceable token because the service
name is already hardcoded in a variety of other places and because,
changing well-known DBus names is something to avoid anyway.

Change-Id: I4341ec0e3d809153571cc70d3bc71153fd72f552
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/org.open_power.Software.Host.Updater.service b/org.open_power.Software.Host.Updater.service
index 94f9cab..41808e8 100644
--- a/org.open_power.Software.Host.Updater.service
+++ b/org.open_power.Software.Host.Updater.service
@@ -10,7 +10,7 @@
 ExecStart=/usr/bin/openpower-update-manager
 Restart=always
 Type=dbus
-BusName={BUSNAME}
+BusName=org.open_power.Software.Host.Updater
 
 [Install]
 WantedBy=multi-user.target