habanalabs: flush only at the end of the map/unmap

Optimize hl_mmu_map and hl_mmu_unmap by not calling flush(ctx)
within per-page loop.

Signed-off-by: Pawel Piskorski <ppiskorski@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
4 files changed