[Bugfix] Fix attention backend signature (#1103)

Author: kyuyeunk

tpu_inference/platforms/tpu_platform.py

@@ -7,6 +7,7 @@
 import vllm.envs as vllm_envs
 from torchax.ops.mappings import j2t_dtype
 from tpu_info import device
+from vllm.attention.backends.abstract import AttentionType
 from vllm.inputs import ProcessorInputs, PromptType
 from vllm.platforms.interface import Platform, PlatformEnum
 from vllm.sampling_params import SamplingParams, SamplingType
@@ -57,7 +58,8 @@ class TpuPlatform(Platform):
     def get_attn_backend_cls(cls, selected_backend: "_Backend", head_size: int,
                              dtype: jnp.dtype, kv_cache_dtype: Optional[str],
                              block_size: int, use_v1: bool, use_mla: bool,
-                             has_sink: bool, use_sparse: bool) -> str:
+                             has_sink: bool, use_sparse: bool,
+                             attn_type: AttentionType) -> str:
         from vllm.attention.backends.registry import _Backend
         if selected_backend != _Backend.PALLAS:
             logger.info("Cannot use %s backend on TPU.", selected_backend)