nod-ai/iree-amd-aie

pack_pipeline_e2e test is failing transiently

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Prefetch lowering config before Packing and set later solves this issue.

Reason for the failure - the lowering_config was non-deterministically not being carried forward after the first application of pack-and-transpose and due to cascading effect tile-and-fuse couldn't perform tiling from 2nd level onwards.

CC: @MaheshRavishankar @nirvedhmeshram @yzhang93