COMPMID-3339: Patch2: Remove paddings from im2col*_nhwc cl kernel

* Remove channel paddings from all nhwc kernels (im2col_3x3_nhwc,
  im2col_9x9_nhwc, im2col_generic_nhwc)
* Validate that input total spatial dimensions (with x and y paddings)
  are bigger than or equal to the kernel spatial dimension.
  - Otherwise it would result in invalid memory reads.
  - This problem likely existed before, but was made obvious with the
    removal of implicit paddings
* Add zero padding validation tests
* Fix Im2ColValidationFixture by not permuting the input shape in case of
  NHWC

Change-Id: I1f895e8938af0e9130cb516106f0b4b665531709
Signed-off-by: SiCong Li <sicong.li@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/3696
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>

0 files changed, 0 insertions, 0 deletions