Implement the code related to the GetMixedComponentVersion()

Change-Id: I98aad97b4cb6498b7f2fc03a2d5ee7c9e949d5f1
Signed-off-by: Chen Gong <curry.gong@amd.com>

server/include/rdc/rdc_api_service.h

@@ -125,6 +125,8 @@ class RdcAPIServiceImpl final : public ::rdc::RdcAPI::Service {
                                        const ::rdc::DiagnosticTestCaseRunRequest* request,
                                        ::rdc::DiagnosticTestCaseRunResponse* reply) override;
 
+  ::grpc::Status GetMixedComponentVersion(::grpc::ServerContext* context, const ::rdc::GetMixedComponentVersionRequest* request,
+                               ::rdc::GetMixedComponentVersionResponse* reply) override;
  private:
   bool copy_gpu_usage_info(const rdc_gpu_usage_info_t& src, ::rdc::GpuUsageInfo* target);
   rdc_handle_t rdc_handle_;