MLBEDSW-10617: Move ReplacePadByExplicitPadding to GraphIR
- Move the ReplacePadByExplicitPadding step to GraphIR optimiser so it can run on TOSA networks as well. TOSA PAD with pad_const = 0 can make use of this optimization.
- Add unit test.
Signed-off-by: Johan Gunnarsson johan.gunnarsson@arm.com Change-Id: I7baee6e82ae420268861c48d9d36e7ae39d7b9fe