COMPMID-1995: Prepare Graph to support different input/output quantization info

- Added support for different input/output qinfo in ActivationLayer and DepthwiseConv
- Added support for different input/output qinfo in ConcatenateLayer introducing ConcatDescriptor
- Added reshape validate
- Allow OutputLayer to return a specific connection index from the input
- Not run Inplace and Depth mutator when input/output quantization info are different

Change-Id: I03f5e416fc43ddd284e1501887202a3145f76d8a
Signed-off-by: Isabella Gottardi <isabella.gottardi@arm.com>
Reviewed-on: https://review.mlplatform.org/c/852
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/arm_compute/graph/LayerDescriptors.h b/arm_compute/graph/LayerDescriptors.h
new file mode 100644
index 0000000..7909932
--- /dev/null
+++ b/arm_compute/graph/LayerDescriptors.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2019 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_CONCAT_DESCRIPTOR_H__
+#define __ARM_COMPUTE_CONCAT_DESCRIPTOR_H__
+
+#include "arm_compute/core/Types.h"
+
+namespace arm_compute
+{
+namespace graph
+{
+namespace descriptors
+{
+/** Common node parameters */
+struct ConcatLayerDescriptor
+{
+    /** Default constructor */
+    ConcatLayerDescriptor()
+        : axis(DataLayoutDimension::CHANNEL), output_qinfo()
+    {
+    }
+
+    /** Constructor concatenate layer descriptor
+     *
+     * @param[in] axis Axis.
+     */
+    ConcatLayerDescriptor(DataLayoutDimension axis)
+        : axis(axis), output_qinfo()
+    {
+    }
+
+    /** Constructor concatenate layer descriptor
+     *
+     * @param[in] axis         Axis.
+     * @param[in] output_qinfo Output quantization info.
+     */
+    ConcatLayerDescriptor(DataLayoutDimension axis, QuantizationInfo output_qinfo)
+        : axis(axis), output_qinfo(output_qinfo)
+    {
+    }
+
+    const DataLayoutDimension axis;         /**< Concatenation Axis */
+    const QuantizationInfo    output_qinfo; /**< Output quantizazion info */
+};
+} // namespace descriptor
+} // namespace graph
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_CONCAT_DESCRIPTOR_H__ */
\ No newline at end of file