[Hardware][ROCM] using current_platform.is_rocm (#9642)

Signed-off-by: wangshuai09 <391746016@qq.com>

vllm/attention/selector.py

@@ -10,7 +10,7 @@ import vllm.envs as envs
 from vllm.attention.backends.abstract import AttentionBackend
 from vllm.logger import init_logger
 from vllm.platforms import current_platform
-from vllm.utils import STR_BACKEND_ENV_VAR, is_hip
+from vllm.utils import STR_BACKEND_ENV_VAR
 
 logger = init_logger(__name__)
 
@@ -208,7 +208,7 @@ def which_attn_to_use(
             logger.info("Cannot use %s backend on TPU.", selected_backend)
         return _Backend.PALLAS
 
-    if is_hip():
+    if current_platform.is_rocm():
         # AMD GPUs.
         selected_backend = (_Backend.ROCM_FLASH if selected_backend
                             == _Backend.FLASH_ATTN else selected_backend)