MLBEDSW-7968: Add fixup for strides when kernel size equals IFM shape

There are networks out there with Pool ops with filter (W, H) equals
IFM (W, H) equals stride (W, H). The stride is technically too large
for the NPU, but we can actually run these ops in the NPU since the
filter is large enough the window doesn't slide. To support these ops
we need to fix the stride so later checks don't put this op on CPU.

Change-Id: I8f0a46b26fb94ee76c33748589536cc5ba07ea59
Signed-off-by: Johan Gunnarsson <johan.gunnarsson@arm.com>