psu: Add phosphor-psu-monitor.service

Creating a new service file for the phosphor-psu-monitor application
created by the phosphor-power-supply subdirectory tree.

Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
Change-Id: I2769f6ac0012fe8849ef266930d8c736a88417ce
diff --git a/meson.build b/meson.build
index d99271d..8740f40 100644
--- a/meson.build
+++ b/meson.build
@@ -29,7 +29,8 @@
 services = [
     'power-supply-monitor@.service',
     'pseq-monitor-pgood.service',
-    'pseq-monitor.service'
+    'pseq-monitor.service',
+    'phosphor-psu-monitor.service'
 ]
 
 foreach service : services