pseq: Add service file

Add service file for power control and power sequence monitoring
combined application. Change meson build files to support.

Signed-off-by: Jim Wright <jlwright@us.ibm.com>
Change-Id: I0c06b0b66c7d02145516564dc98123a4633498b3
diff --git a/meson_options.txt b/meson_options.txt
index 10710b2..c989334 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -60,7 +60,7 @@
     description: 'Enable support for power sequencer control'
 )
 option(
-    'sequencer-monitor-ng', type: 'boolean',
+    'power-control', type: 'boolean',
     description: 'Enable support for power sequencer control utilizing JSON configuration and supporting multiple systems in a single build image'
 )
 option(