Create tensor for the primary backend (#2970)

* create tensor for the primary backend

* move private objects to protected

src/ngraph/runtime/hybrid/hybrid_backend.cpp

@@ -31,13 +31,13 @@ shared_ptr<runtime::Tensor>
     runtime::hybrid::HybridBackend::create_tensor(const element::Type& element_type,
                                                   const Shape& shape)
 {
-    return make_shared<HybridTensor>(element_type, shape);
+    return m_backend_list[0]->create_tensor(element_type, shape);
 }
 
 shared_ptr<runtime::Tensor> runtime::hybrid::HybridBackend::create_tensor(
     const element::Type& element_type, const Shape& shape, void* memory_pointer)
 {
-    return make_shared<HybridTensor>(element_type, shape, memory_pointer);
+    return m_backend_list[0]->create_tensor(element_type, shape, memory_pointer);
 }
 
 shared_ptr<runtime::Executable>

src/ngraph/runtime/hybrid/hybrid_backend.hpp

@@ -54,7 +54,7 @@ public:
     bool is_supported(const ngraph::Node& node) const override;
 
     void set_debug_enabled(bool flag) { m_debug_enabled = flag; }
-private:
+protected:
     std::vector<std::shared_ptr<runtime::Backend>> m_backend_list;
     bool m_debug_enabled = false;
 };