COMPMID-2757: Add support for QASYMM8_SIGNED in CLDepthwiseConvolutionLayer

Change-Id: I1f292f98bc3a213ba5b26ac88aa78160c809cb87
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/2540
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/CL/cl_kernels/depthwise_convolution_quantized.cl b/src/core/CL/cl_kernels/depthwise_convolution_quantized.cl
index dc8078a..3cfa707 100644
--- a/src/core/CL/cl_kernels/depthwise_convolution_quantized.cl
+++ b/src/core/CL/cl_kernels/depthwise_convolution_quantized.cl
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2019 ARM Limited.
+ * Copyright (c) 2017-2020 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -1634,7 +1634,7 @@
  * @note It is possible to select the activation function to apply using -DACTIVATION_TYPE e.g. -DACTIVATION_TYPE=relu
  * @note A, B variables required by some activation functions are set using -DA_VAL= and -DB_VAL= respectively
  *
- * @param[in] src_ptr                                          Pointer to the source tensor. Supported data types: QASYMM8
+ * @param[in] src_ptr                                          Pointer to the source tensor. Supported data types: QASYMM8/QASYMM8_SIGNED
  * @param[in] src_stride_x                                     Stride of the source tensor in X dimension (in bytes)
  * @param[in] src_step_x                                       src_stride_x * number of elements along X processed per workitem(in bytes)
  * @param[in] src_stride_y                                     Stride of the source tensor in Y dimension (in bytes)
@@ -1654,7 +1654,7 @@
  * @param[in] dst_stride_w                                     Stride of the destination tensor in W dimension (in bytes)
  * @param[in] dst_step_w                                       dst_stride_w * number of elements along W processed per workitem(in bytes)
  * @param[in] dst_offset_first_element_in_bytes                The offset of the first element in the destination tensor
- * @param[in] weights_ptr                                      Pointer to the weights tensor. Supported data types: QASYMM8/QSYMM8_PER_CHANNEL
+ * @param[in] weights_ptr                                      Pointer to the weights tensor. Supported data types: QASYMM8/QASYMM8_SIGNED/QSYMM8_PER_CHANNEL
  * @param[in] weights_stride_x                                 Stride of the weights tensor in X dimension (in bytes)
  * @param[in] weights_step_x                                   weights_stride_x * number of elements along X processed per workitem(in bytes)
  * @param[in] weights_stride_y                                 Stride of the weights tensor in Y dimension (in bytes)