Add SAI_HASH_ALGORITHM_END to sai_hash_algorithm_t enum.

Author: abhishek-7

inc/saiswitch.h

@@ -220,6 +220,8 @@ typedef enum _sai_hash_algorithm_t
     /** Upper 16 bits of Jenkins hash algorithm */
     SAI_HASH_ALGORITHM_JENKINS_HI = 10,
 
+    /** End of hash algorithms */
+    SAI_HASH_ALGORITHM_END
 } sai_hash_algorithm_t;
 
 /**