Remove functions to wait for cache pending requests

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>

inc/ocf_cache.h

@@ -160,20 +160,6 @@ bool ocf_cache_is_device_attached(ocf_cache_t cache);
  */
 bool ocf_cache_is_running(ocf_cache_t cache);
 
-/**
- * @brief Wait for all IO to finish
- *
- * @param[in] cache Cache object
- */
-void ocf_cache_wait_for_io_finish(ocf_cache_t cache);
-
-/**
- * @brief Check if cache has any unfunished requests
- *
- * @param[in] cache Cache object
- */
-bool ocf_cache_has_pending_requests(ocf_cache_t cache);
-
 /**
  * @brief Check if cleaning triggered by eviction runs on the cache
  *