regulators: Add configure support to Rail class

Implemented the configure() method in the Rail class.  This method
applies any configuration changes that are defined for the rail.

Also added a few missing #includes in the configuration_tests.cpp file.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I4164621f6d599bbf1417ebb9328a35bd2b2d656e
diff --git a/phosphor-regulators/src/rail.cpp b/phosphor-regulators/src/rail.cpp
new file mode 100644
index 0000000..e95b396
--- /dev/null
+++ b/phosphor-regulators/src/rail.cpp
@@ -0,0 +1,35 @@
+/**
+ * Copyright © 2020 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "rail.hpp"
+
+#include "chassis.hpp"
+#include "device.hpp"
+#include "system.hpp"
+
+namespace phosphor::power::regulators
+{
+
+void Rail::configure(System& system, Chassis& chassis, Device& device)
+{
+    // If configuration changes are defined for this rail, apply them
+    if (configuration)
+    {
+        configuration->execute(system, chassis, device, *this);
+    }
+}
+
+} // namespace phosphor::power::regulators