COMPMID-2194: Refactor activation function macro in OpenCL. Change all activation calls to macro from activation_float_helpers.h

The different kernels now call the macro from
activation_float_helpers.h. activation_helpers.h is now removed.

Change-Id: I2e1314c6bc891809e88590d99e048072541cca14
Signed-off-by: Usama Arif <usama.arif@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1123
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/utils/TypePrinter.h b/utils/TypePrinter.h
index a71e036..b22e068 100644
--- a/utils/TypePrinter.h
+++ b/utils/TypePrinter.h
@@ -385,6 +385,9 @@
         case ActivationLayerInfo::ActivationFunction::TANH:
             os << "TANH";
             break;
+        case ActivationLayerInfo::ActivationFunction::IDENTITY:
+            os << "IDENTITY";
+            break;
         default:
             ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
     }