Enable PSUSensor support

Add psusensor service to enable PSUSensor.

Tested By:
After BMC started, run ipmitool sensor list, all PSU sensors can show
correct name and value.

Signed-off-by: Cheng C Yang <cheng.c.yang@linux.intel.com>
Change-Id: I55d52c3cc71243a1db10a47551872b458ad9d21b
diff --git a/service_files/xyz.openbmc_project.psusensor.service b/service_files/xyz.openbmc_project.psusensor.service
new file mode 100644
index 0000000..ec4a56b
--- /dev/null
+++ b/service_files/xyz.openbmc_project.psusensor.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=PSU Sensor
+StopWhenUnneeded=false
+
+[Service]
+Restart=always
+RestartSec=5
+ExecStart=/usr/bin/psusensor
+
+[Install]
+WantedBy=multi-user.target