Marked unnecessary member variables as @deprecated

Restored protected properties of Image class and marked them as `@deprecated`.

Author: yogeshks

app/code/Magento/Catalog/Block/Product/Image.php

@@ -19,6 +19,19 @@
  */
 class Image extends \Magento\Framework\View\Element\Template
 {
+    /**
+     * @deprecated since version 2.2-develop
+     */
+    protected $imageHelper;
+    /**
+     * @deprecated since version 2.2-develop
+     */
+    protected $product;
+    /**
+     * @deprecated since version 2.2-develop
+     */
+    protected $attributes = [];
+    
     /**
      * @param \Magento\Framework\View\Element\Template\Context $context
      * @param array $data