[MRV2] Fix for DS v3.2 (#38030)

Signed-off-by: Woosuk Kwon <woosuk@inferact.ai>

vllm/v1/worker/gpu/attn_utils.py

@@ -115,9 +115,12 @@ def _reshape_kv_cache(
 ) -> dict[str, torch.Tensor]:
     kv_caches: dict[str, torch.Tensor] = {}
     for kv_cache_group_spec in kv_cache_config.kv_cache_groups:
+        for layer_name in kv_cache_group_spec.layer_names:
             kv_cache_spec = kv_cache_group_spec.kv_cache_spec
+            if isinstance(kv_cache_spec, UniformTypeKVCacheSpecs):
+                kv_cache_spec = kv_cache_spec.kv_cache_specs[layer_name]
             assert isinstance(kv_cache_spec, AttentionSpec)
-        for layer_name in kv_cache_group_spec.layer_names:
+
             raw_tensor = kv_cache_raw_tensors[layer_name]
             assert raw_tensor.numel() % kv_cache_spec.page_size_bytes == 0
             num_blocks = raw_tensor.numel() // kv_cache_spec.page_size_bytes