COMPMID-3851: Fix regression on NEDepthwiseConvolutionLayerNativeKernel

COMPMID-3851: Fix regression on NEDepthwiseConvolutionLayerNativeKernel

The exit condition of some for loops in quantized version
of the kernel with depth_multiplier=1 is decided
during compilation to fix performance issue.

Change-Id: I849b3d63b2a2cf5eb374ae681898ae1c296fb4fe
Signed-off-by: Sang-Hoon Park <sang-hoon.park@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4392
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>