[pytorch/executorch][diff_train] NXP backend: Enable Add Tensor with new Neutron flow (#19550)

[SS-JIA]

Stack from ghstack (oldest at bottom):

• Fix cortex_m test failures from D106339880 #19783
• [pytorch/executorch][diff_train] Cortex-M backend: Add AoT scratch-buffer planning. (#19636) #19782
• [pytorch/executorch][diff_train] Arm backend: Add bf16 support for aten.index_select and aten.unfold_copy (#19751) #19781
• [pytorch/executorch][diff_train] NXP backend: Enable Sub Tensor with new Neutron flow (#19588) #19780
• [pytorch/executorch][diff_train] Arm backend: Exclude build metadata from license checks #19779
• -> [pytorch/executorch][diff_train] NXP backend: Enable Add Tensor with new Neutron flow (#19550) #19778

Summary

Add tests verifying correct support for add.tensor by the Neutron
backend using the new Neutron MLIR flow.

Test plan

Unit tests provided.

cc @robert-kalmar

Internal:
<< DO NOT EDIT BELOW THIS LINE >>

GitHub Author: roman-janik-nxp roman.janik@nxp.com
GitHub Repo: pytorch/executorch
GitHub Pull Request: #19550

Initially generated by: https://www.internalfb.com/intern/sandcastle/job/49539596319653446/

This was imported as part of a DiffTrain.
Please review this as soon as possible. Since it is a direct copy of a commit on
GitHub, there shouldn't be much to do.

diff-train-source-id: b69cbcd

Differential Revision: D106229484

[pytorch-bot]

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