APPBROWSER-366: Add DepthwiseConvolutionLayer(fp16 only) support.

Change-Id: I051b7e56b60bf1a55cdf014539ef71346d3aee26
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/114737
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
12 files changed