NXP backend: added support for aten.pad with mode reflect - #21515

{"FAILED":[{"workflowId":30892854546,"workflowUniqueId":63454257,"id":91938782984,"runnerName":"i-04bd5e0d870c53a0a","authorEmail":"vaclav.novak@nxp.com","name":"pull / unittest-editable / linux / linux-job","jobName":"unittest-editable / linux / linux-job","conclusion":"failure","completed_at":"2026-08-04T09:56:23.000000000Z","html_url":"https://github.com/pytorch/executorch/actions/runs/30892854546/job/91938782984","logUrl":"https://ossci-raw-job-status.s3.amazonaws.com/log/pytorch/executorch/91938782984","head_branch":"feature/EIEX-888-add-pad-support","pr_number":21515,"head_sha":"8c50a2602836f258f7b79bf772f9a3010ab859f7","head_sha_timestamp":"2026-08-04T08:38:08Z","failure_captures":["backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_all_models_with_recipes"],"failure_lines":["FAILED backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_all_models_with_recipes - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>"],"failure_context":[],"time":"2026-08-04T08:39:11.000000000Z"}],"FLAKY":[],"BROKEN_TRUNK":[],"UNSTABLE":[],"UNKNOWN":[],"AWAITING_APPROVAL":[]}