[Bugfix] Initialize attention bias on the same device as Query/Key/Value for QwenVL Series #14031
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Similar issue as #13468 where the attention bias in vLLM's xformers backend is currently initialized on the default device, rather than the device of the Q/K/V tensors.
The #13468 workaround doesn't quite solve the problem for QwenVL series when vLLM is used in conjunction with libraries like trl for GRPO training.
The cuda device mismatched issue still exists for xformer backend.
[rank0]: ValueError: Attention bias and Query/Key/Value should be on the same device
This PR solve cuda device mismatch problem for QwenVL Series