增加dcu_alloc_decode_kernel实现

sgl-kernel/python/sgl_kernel/kvcacheio.py

@@ -10,6 +10,25 @@ def is_hip() -> bool:
 _is_hip = is_hip()
 
 
+def dcu_alloc_decode_kernel(
+    seq_lens_ptr: torch.Tensor,   
+    last_loc_ptr: torch.Tensor,    
+    free_page_ptr: torch.Tensor ,   
+    out_indices: torch.Tensor , 
+    bs: int,          
+    bs_upper: int,              
+    page_size: int,              
+):
+    torch.ops.sgl_kernel.dcu_alloc_decode_kernel(
+        seq_lens_ptr,
+        last_loc_ptr,
+        free_page_ptr,
+        out_indices,
+        bs,
+        bs_upper,
+        page_size,
+    )
+
 def transfer_kv_per_layer(
     src_k: torch.Tensor,
     dst_k: torch.Tensor,