Graph parallel for SEED-OSS (#1222)

* Graph parallel for SEED-OSS

* Cleanup

src/llama.cpp

@@ -1755,6 +1755,7 @@ static bool is_model_split_supported(const llama_model & model) {
         LLM_ARCH_OPENAI_MOE,
         LLM_ARCH_ERNIE4_5_MOE,
         LLM_ARCH_MINIMAX_M2,
+        LLM_ARCH_SEED_OSS,
     };
     auto it =  k_supported.find(model.arch);
     return it != k_supported.end();