NPX backend: added support for aten.rsqrt using new Neutron MLIR flow

[novak-vaclav]

Summary

Added support for aten.rsqrt using new Neutron MLIR flow.

Test plan

tests can be manually run using pytest -c /dev/null backends/nxp/tests/

cc @robert-kalmar @JakeStevens @digantdesai @rascani @MartinPavella

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21009

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❌ 2 New Failures, 1 Unrelated Failure

As of commit f785cd0 with merge base 0f02e85 ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  ../../dev/ir/converter/node_converter/test_rsqrt_converter.py::TestRsqrt::test__input_shapes[4D]

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (trunk failure)

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