Uncouple lookup() and set_hot()

Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>

src/engine/engine_common.h

@@ -234,6 +234,15 @@ struct ocf_engine_callbacks
  */
 int ocf_engine_prepare_clines(struct ocf_request *req);
 
+/**
+* @brief Check if the OCF request is mapped to cache (lookup cache)
+*
+* @note This function checks if there is a HIT without updating hotness info
+*
+* @param req OCF request
+*/
+void ocf_engine_lookup(struct ocf_request *req);
+
 /**
  * @brief Traverse OCF request (lookup cache)
  *
@@ -285,4 +294,6 @@ void inc_fallback_pt_error_counter(ocf_cache_t cache);
 
 void ocf_engine_on_resume(struct ocf_request *req);
 
+void ocf_engine_set_hot(struct ocf_request *req);
+
 #endif /* ENGINE_COMMON_H_ */