COMPMID-2306: CLDepthwiseConvolution: support for QUANT8_PER_CHANNEL_SYMM

Change-Id: I18c886400daa2dcba0b91011bc4e503d807a4732
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/2143
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Giorgio Arena <giorgio.arena@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/core/CL/CLHelpers.h b/arm_compute/core/CL/CLHelpers.h
index 1d647a8..9130e05 100644
--- a/arm_compute/core/CL/CLHelpers.h
+++ b/arm_compute/core/CL/CLHelpers.h
@@ -50,6 +50,22 @@
  */
 std::string get_cl_type_from_data_type(const DataType &dt);
 
+/** Translates a tensor data type to the appropriate OpenCL promoted type.
+ *
+ * @param[in] dt @ref DataType to be used to get the promoted OpenCL type.
+ *
+ * @return The string specifying the OpenCL type to be used.
+ */
+std::string get_cl_promoted_type_from_data_type(const DataType &dt);
+
+/** Translates the element size to an unsigned integer data type
+ *
+ * @param[in] element_size Size in bytes of an element.
+ *
+ * @return The string specifying the OpenCL type to be used.
+ */
+std::string get_cl_unsigned_type_from_element_size(size_t element_size);
+
 /** Translates a tensor data type to the appropriate OpenCL select type.
  *
  * @param[in] dt @ref DataType to be translated to OpenCL select type.