Add kind_specialization_constants_buffer to kernel_desc.hpp

Author: dm-vodopyanov

sycl/include/CL/sycl/detail/kernel_desc.hpp

@@ -26,7 +26,8 @@ enum class kernel_param_kind_t {
   kind_accessor = 0,
   kind_std_layout = 1, // standard layout object parameters
   kind_sampler = 2,
-  kind_pointer = 3
+  kind_pointer = 3,
+  kind_specialization_constants_buffer = 4
 };
 
 // describes a kernel parameter