COMPMID-2194: Refactor activation function macro in OpenCL. New Macros for activation.

This commit contains the new macros for activation. Only the
activation_layer utilizes the new macros in this commit.

Change-Id: I2fa8567cc876e8cb67a1e876652bc348b7ed23ea
Signed-off-by: Usama Arif <usama.arif@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1104
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/CL/CLKernelLibrary.cpp b/src/core/CL/CLKernelLibrary.cpp
index df60001..b2d7e23 100644
--- a/src/core/CL/CLKernelLibrary.cpp
+++ b/src/core/CL/CLKernelLibrary.cpp
@@ -1036,6 +1036,9 @@
     concat_str += " -DARM_COMPUTE_DEBUG_ENABLED";
 #endif // defined(ARM_COMPUTE_DEBUG_ENABLED)
 
+    GPUTarget gpu_arch = get_arch_from_target(get_target_from_device(_device));
+    concat_str += " -DGPU_ARCH=" + support::cpp11::to_string(
+                      static_cast<std::underlying_type<GPUTarget>::type>(gpu_arch));
     if(fp16_supported())
     {
         concat_str += " -DARM_COMPUTE_OPENCL_FP16_ENABLED=1 ";