MLBEDSW-9093: Relocate MoveSplitSliceToConsumer

 - Fixed output diff in regression tests
 - MoveSplitSliceToConsumer must run after any other optimisation
that can change ifm/ofm shapes
 - Since graphir_optimiser has functions that can change shapes
MoveSplitSliceToConsumer must be run in this step instead of
tflite_graph_optimiser

Change-Id: Ifa0f42d977e719111099e16d8bc98311e3bb1d62
Signed-off-by: Johan Alfven <johan.alfven@arm.com>