[AMD][PD] enable mori transfer for PD decode DCP

python/sglang/srt/arg_groups/pd_disaggregation_hook.py

@@ -56,11 +56,12 @@ def handle_pd_disaggregation(server_args: ServerArgs) -> None:
         if cfg.disaggregation_transfer_backend not in (
             "mooncake",
             "nixl",
+            "mori",
             "fake",
         ):
             raise ValueError(
                 "PD decode DCP requires --disaggregation-transfer-backend "
-                "mooncake, nixl, or fake for synthetic benchmarking, got "
+                "mooncake, nixl, mori, or fake for synthetic benchmarking, got "
                 f"{cfg.disaggregation_transfer_backend!r}."
             )
         if cfg.disaggregation_decode_enable_radix_cache: