Update SAI Minor version to v1.16.4 (#2215)

Author: tjchadaga

inc/saiversion.h

@@ -29,7 +29,7 @@
 
 #define SAI_MAJOR 1
 #define SAI_MINOR 16
-#define SAI_REVISION 3
+#define SAI_REVISION 4
 
 #define SAI_VERSION(major, minor, revision) (10000 * (major) + 100 * (minor) + (revision))