Qualcomm AI Engine Direct - Replace private variable with function

[shewu-quic]

Summary:

• To improve readability, replace is_bert_ with is_bert()

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8724

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 36e0af5 with merge base 5a594a7 ():

NEW FAILURE - The following job has failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels

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-llava-runner-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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