Revert "[multimodal] Allow generate and prefill to take move sematics"

[larryliu0820]

Reverts #14643

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15000

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❌ 3 New Failures, 14 Pending, 1 Unrelated Failure

As of commit db4ce8d with merge base 3591604 ():

NEW FAILURES - The following jobs have failed:

• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 6598e760855992bcebf317238df01dc0268d629da1e07a68493e7144da46cff6 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 203215c959a6b09eecbd9d5026c5bc7fa98188975b1c4346cdf2544758235736 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t ce53f453b6f463041f904e28ddb6174d2a42e09767132cd6711d94ccd62e8264 /exec failed with exit code 1

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

• pull / test-models-linux (add_mul, portable, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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