Make CLArithmeticAddition kernel and function state-less

Resolves COMPMID-4006

Change-Id: Iddc32b0b250142aac9a4a7b9dc0eef462d196025
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4913
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Sang-Hoon Park <sang-hoon.park@arm.com>
diff --git a/arm_compute/runtime/CL/functions/CLPReluLayer.h b/arm_compute/runtime/CL/functions/CLPReluLayer.h
index ab32bcc..1751fda 100644
--- a/arm_compute/runtime/CL/functions/CLPReluLayer.h
+++ b/arm_compute/runtime/CL/functions/CLPReluLayer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019-2020 Arm Limited.
+ * Copyright (c) 2019-2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -35,7 +35,7 @@
 
 namespace experimental
 {
-/** Basic function to run @ref CLArithmeticOperationKernel for PRELU
+/** Basic function to run @ref arm_compute::opencl::kernels::ClArithmeticKernel for PRELU
  *
  * @note The function implements an activation layer with the PRELU activation function.
  */
@@ -69,7 +69,7 @@
 };
 } // namespace experimental
 
-/** Basic function to run @ref CLArithmeticOperationKernel for PRELU
+/** Basic function to run @ref opencl::kernels::ClArithmeticKernel for PRELU
  *
  * @note The function implements an activation layer with the PRELU activation function.
  */