COMPMID-1188: Set all arguments to const in NEDepthwiseConvolutionLayer::validate()

Change-Id: If922d5ea118910f651f986ff40f0c0a2b8bfc459
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/144614
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
2 files changed