Support more open-source models

[neuropilot-captain]

Summary

• This PR adds support for 5 more open-source models: dcgan, wav2letter, vit_b_16, mobilebert, emformer_rnnt
• Update model export script

cc @cccclai @cbilgin

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10463

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:x: 3 New Failures, 1 Unrelated Failure

As of commit b28672acb51c659ae54d8006d3047fd0395c94e2 with merge base a325c56864c5b25630c1ebda03c8f16a96a02a19 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / check-urls (gh) Process completed with exit code 1.
• Check Labels / Check labels (gh) RuntimeError: Error checking labels: PR does not have required labels
• Lint / lintrunner / linux-job (gh) >>> Lint for examples/mediatek/model_export_scripts/wav2letter.py:

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-llava-runner-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[github-actions[bot]]

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[neuropilot-captain]

@pytorchbot label "partner: mediatek"

[pytorch-bot[bot]]

Didn't find following labels among repository labels: release note: Add 5 open-source model export scripts for MediaTek backend

[neuropilot-captain]

@pytorchbot label "partner: mediatek"