MLBEDSW-6430: MLCE: Update to graph has sequential ethos-u ops

Update to the "Vela splitting network into two ethos operators" patch
allowing the CPU pass to be moved last in the pass_list.

Signed-off-by: Johan Alfven <johan.alfven@arm.com>
Change-Id: I2e8a299101e5d65e963327bed7c8d891fff6523e