entity-manager: create power_status_monitor.cpp

These functions belong to PowerStatusMonitor class but were still in
utils.cpp.

Code was only moved and otherwise unchanged.

Tested: Inspection only.

Change-Id: I179eb53718df376116e056b1285f7d1eb4a0ec22
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/src/entity_manager/meson.build b/src/entity_manager/meson.build
index 0fe71dd..200c9f9 100644
--- a/src/entity_manager/meson.build
+++ b/src/entity_manager/meson.build
@@ -14,6 +14,7 @@
     'dbus_interface.cpp',
     'perform_scan.cpp',
     'perform_probe.cpp',
+    'power_status_monitor.cpp',
     'overlay.cpp',
     'topology.cpp',
     'utils.cpp',