COMPMID-617: Add validation methods to ML CL functions.

Adds validation support to:
- CLDirectConvolution
- CLNormalizationLayer
- CLSoftmaxLayer

Change-Id: I9bd1e925e6db057c799169405f82ed21d20b87ee
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/95939
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
diff --git a/arm_compute/runtime/CL/functions/CLNormalizationLayer.h b/arm_compute/runtime/CL/functions/CLNormalizationLayer.h
index 1e0b27a..7e18ce5 100644
--- a/arm_compute/runtime/CL/functions/CLNormalizationLayer.h
+++ b/arm_compute/runtime/CL/functions/CLNormalizationLayer.h
@@ -56,6 +56,16 @@
      * @param[in]      norm_info Normalization layer information like the normalization type, normalization size and other parameters.
      */
     void configure(ICLTensor *input, ICLTensor *output, const NormalizationLayerInfo &norm_info);
+    /** Static function to check if given info will lead to a valid configuration of @ref CLNormalizationLayer
+     *
+     * @param[in] input     Source tensor. 3 lower dims represent a single input with dimensions [width, height, IFM],
+     *                      and an optional 4th dimension for batch of inputs. Data types supported: F16/F32
+     * @param[in] output    Destination tensor. Dimensions, data type and number of channels must match the input ones.
+     * @param[in] norm_info Normalization layer information like the normalization type, normalization size and other parameters.
+     *
+     * @return an error status
+     */
+    static Error validate(const ITensorInfo *input, const ITensorInfo *output, const NormalizationLayerInfo &norm_info);
 
     // Inherited methods overridden:
     void run() override;