MLBEDSW-6371: Output diff caused by operator clone bug

- Modify the operator clone function to also clone resampling mode
attribute.

A previous patch changed the ifm resampling mode to be an attribute of
an operator rather than a tensor but did not modify the operator clone
function to clone the new attribute.

Signed-off-by: Rickard Bolin <rickard.bolin@arm.com>
Change-Id: I7a2f6103666a0997f657de20ad962e849976b904