Add object manager

Added object manager to sensor node so that it can be queried mapper
and GetManagedObjects method can be called.

Tested: verified this using busctl command and see object manager
interface has been added to this service.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Change-Id: I53e361ea81cabbba78aca2cec4939601d615d232
diff --git a/meson.build b/meson.build
index cec97e7..cfcbe67 100644
--- a/meson.build
+++ b/meson.build
@@ -28,6 +28,7 @@
 conf_data.set('HEALTH_CONFIG_FILE', '"/etc/healthMon/bmc_health_config.json"')
 conf_data.set('HEALTH_BUS_NAME', '"xyz.openbmc_project.HealthMon"')
 conf_data.set('HEALTH_SENSOR_PATH', '"/xyz/openbmc_project/sensors/utilization/"')
+conf_data.set('SENSOR_OBJPATH', '"/xyz/openbmc_project/sensors"')
 
 configure_file(output : 'config.h',
                configuration : conf_data)