Set the service busname correctly

The BusName in the service unit file was {BUSNAME}, and it depends on
the tools in obmc-phosphor-dbus-service.bbclass to translate the
{BUSNAME} to the D-Bus service name.

Change it to the D-Bus service name specifically so that it does not
depend on such tools to install the service.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I1705de25a3244078963847e5c122a4bcb9eda75e
diff --git a/service/xyz.openbmc_project.Software.Psu.Updater.service b/service/xyz.openbmc_project.Software.Psu.Updater.service
index 7597e7c..e1f708b 100644
--- a/service/xyz.openbmc_project.Software.Psu.Updater.service
+++ b/service/xyz.openbmc_project.Software.Psu.Updater.service
@@ -9,7 +9,7 @@
 ExecStart=/usr/bin/phosphor-psu-code-manager
 Restart=always
 Type=dbus
-BusName={BUSNAME}
+BusName=xyz.openbmc_project.Software.Psu.Updater
 
 [Install]
 WantedBy=multi-user.target