[Bugfix]Fix hang bug using dp attention with HiRadixCache (#7159)

Signed-off-by: huanglong <huanglong@linux.alibaba.com>

python/sglang/srt/managers/scheduler.py

@@ -558,7 +558,11 @@ class Scheduler(
                 self.tree_cache = HiRadixCache(
                     req_to_token_pool=self.req_to_token_pool,
                     token_to_kv_pool_allocator=self.token_to_kv_pool_allocator,
-                    tp_cache_group=self.tp_cpu_group,
+                    tp_cache_group=(
+                        self.attn_tp_cpu_group
+                        if self.server_args.enable_dp_attention
+                        else self.tp_cpu_group
+                    ),
                     page_size=self.page_size,
                     hicache_ratio=server_args.hicache_ratio,
                     hicache_size=server_args.hicache_size,