regulators: Add monitorSensors support to Rail

Implemented the monitorSensors() method in the Rail class.  This method
reads the sensors for a voltage rail.

Signed-off-by: Bob King <Bob_King@wistron.com>
Change-Id: Ifbe6461349d20fee1eba233844c95c1046e1a54a
diff --git a/phosphor-regulators/src/rail.cpp b/phosphor-regulators/src/rail.cpp
index e95b396..7d90e77 100644
--- a/phosphor-regulators/src/rail.cpp
+++ b/phosphor-regulators/src/rail.cpp
@@ -32,4 +32,13 @@
     }
 }
 
+void Rail::monitorSensors(System& system, Chassis& chassis, Device& device)
+{
+    // If sensor monitoring is defined for this rail, read the sensors.
+    if (sensorMonitoring)
+    {
+        sensorMonitoring->execute(system, chassis, device, *this);
+    }
+}
+
 } // namespace phosphor::power::regulators