Arm backend: run RIFE QAT flow in channels-last

[robell]

Change-Id: If842e08ba261e791a823e4d4c228e71a1d926e46
Signed-off-by: Rob Elliott Robert.Elliott@arm.com

small adjustment for the example to ensure the inputs are channels last to conform to heuristic expectations.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @rascani

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