[XPU] Whisper model support on XPU Platform (#25123)

Signed-off-by: chzhang <chaojun.zhang@intel.com>

vllm/attention/layer.py

@@ -391,8 +391,8 @@ class MultiHeadAttention(nn.Module):
             backend = _Backend.FLASH_ATTN
             use_upstream_fa = True
 
-        if current_platform.is_rocm():
-            # currently, only torch_sdpa is supported on rocm
+        if current_platform.is_rocm() or current_platform.is_xpu():
+            # currently, only torch_sdpa is supported on rocm/xpu
             self.attn_backend = _Backend.TORCH_SDPA
         else:
 

vllm/v1/worker/utils.py

@@ -282,7 +282,7 @@ def bind_kv_cache(
             # TODO - analyze where runner_kv_caches is used and the right
             # way to ensure it properly reflects multiple attention layers
             # in the same decoder block.
-            if current_platform.is_cuda():
+            if current_platform.is_cuda() or current_platform.is_xpu():
                 # We know that the GPU runner is not impacted by this
                 # case. Some test code depends on runner_kv_caches, but
                 # not in a way that's impacted by ignoring this.