COMPMID-2309 : CLConvolutionLayer: support QUANT8_SYMM_PER_CHANNEL filters

Change-Id: I16f6758b768ede404a064db057302ded706e1e8a
Signed-off-by: Vidhya Sudhan Loganathan <vidhyasudhan.loganathan@arm.com>
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/2215
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/CL/cl_kernels/convolution_layer.cl b/src/core/CL/cl_kernels/convolution_layer.cl
index 2b75b45..874b78e 100644
--- a/src/core/CL/cl_kernels/convolution_layer.cl
+++ b/src/core/CL/cl_kernels/convolution_layer.cl
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 ARM Limited.
+ * Copyright (c) 2017-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -29,7 +29,7 @@
  * @note Datatype should be given as a preprocessor argument using -DDATA_TYPE=type. e.g. -DDATA_TYPE=short
  * @note The number of groups should be given as a preprocessor argument using -DNUM_GROUPS=number. e.g. -DNUM_GROUPS=2
  *
- * @param[in]  src_ptr                            Pointer to the source tensor. Supported data types: F16/F32
+ * @param[in]  src_ptr                            Pointer to the source tensor. Supported data types: All
  * @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)
@@ -43,7 +43,7 @@
  * @param[in]  dst_stride_y                       Stride of the destination tensor in Y dimension (in bytes)
  * @param[in]  dst_step_y                         dst_stride_y * number of elements along Y 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]  bias_ptr                           Pointer to the bias tensor. Same as @p src_ptr
+ * @param[in]  bias_ptr                           Pointer to the bias tensor. Supported data types: F16/F32, for quantized types this must be nullptr
  * @param[in]  bias_stride_x                      Stride of the bias tensor in X dimension (in bytes)
  * @param[in]  bias_step_x                        bias_stride_x * number of elements along X processed per workitem(in bytes)
  * @param[in]  bias_offset_first_element_in_bytes The offset of the first element in the source tensor