regulators: Implement Configuration execution

Implement the execute() method of the Configuration class.  This method
configures a regulator device/rail by executing actions from the JSON
config file.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Idb133516f9f425da75079f6c24f5f0d70c6eb0e2
diff --git a/phosphor-regulators/src/meson.build b/phosphor-regulators/src/meson.build
index d8616f6..98449fb 100644
--- a/phosphor-regulators/src/meson.build
+++ b/phosphor-regulators/src/meson.build
@@ -6,6 +6,7 @@
 phosphor_regulators_library_source_files = [
     'chassis.cpp',
     'config_file_parser.cpp',
+    'configuration.cpp',
     'device.cpp',
     'exception_utils.cpp',
     'id_map.cpp',