COMPMID-2774: Add support for QASYMM8_SIGNED in NEReductionOperation, NEReduceMean and NEArgMinMaxLayer

Signed-off-by: Luca Foschiani <luca.foschiani@arm.com>
Change-Id: Icf198a983c8ce2c6cd8451a1190bb99115eac3af
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/2652
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-by: Giorgio Arena <giorgio.arena@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/runtime/NEON/functions/NEArgMinMaxLayer.h b/arm_compute/runtime/NEON/functions/NEArgMinMaxLayer.h
index e4a7b94..c50f358 100644
--- a/arm_compute/runtime/NEON/functions/NEArgMinMaxLayer.h
+++ b/arm_compute/runtime/NEON/functions/NEArgMinMaxLayer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019 ARM Limited.
+ * Copyright (c) 2018-2020 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -54,7 +54,7 @@
     NEArgMinMaxLayer(std::shared_ptr<IMemoryManager> memory_manager = nullptr);
     /** Set the input and output tensors.
      *
-     * @param[in]  input  Input source tensor. Data types supported: QASYMM8/S32/F16/F32.
+     * @param[in]  input  Input source tensor. Data types supported: QASYMM8_SIGNED/QASYMM8/S32/F16/F32.
      * @param[in]  axis   Axis to find max/min index.
      * @param[out] output Output source tensor. Data types supported: U32/S32.
      * @param[in]  op     Operation to perform: min or max
@@ -62,7 +62,7 @@
     void configure(ITensor *input, int axis, ITensor *output, const ReductionOperation &op);
     /** Static function to check if given info will lead to a valid configuration of @ref NEArgMinMaxLayer
      *
-     * @param[in] input  Input source tensor info. Data types supported: QASYMM8/S32/F16/F32.
+     * @param[in] input  Input source tensor info. Data types supported: QASYMM8_SIGNED/QASYMM8/S32/F16/F32.
      * @param[in] axis   Axis to find max/min index.
      * @param[in] output Output source tensor info. Data types supported: U32/S32.
      * @param[in] op     Operation to perform: min or max