The Diagnostic API interface

The API interface defines how the caller will use the API. An
example also shows how the API can be used.
It also defines the RdcDiagnostic module which can load the
library dynamically and then dispatch diagnostic test to run.

Change-Id: I1e041aab86f7e19338860f5ba65262977f4ea9cb

include/rdc_lib/RdcModuleMgr.h

@@ -26,6 +26,7 @@ THE SOFTWARE.
 #include "rdc_lib/rdc_common.h"
 #include "rdc/rdc.h"
 #include "rdc_lib/RdcTelemetry.h"
+#include "rdc_lib/RdcDiagnostic.h"
 
 namespace amd {
 namespace rdc {
@@ -33,6 +34,7 @@ namespace rdc {
 class RdcModuleMgr {
  public:
     virtual RdcTelemetryPtr get_telemetry_module() = 0;
+    virtual RdcDiagnosticPtr get_diagnostic_module() = 0;
 };
 
 typedef std::shared_ptr<RdcModuleMgr> RdcModuleMgrPtr;