[Core][VLM] Add precise multi-modal placeholder tracking (#8346)

Signed-off-by: Peter Salas <peter@fixie.ai>

examples/offline_inference_audio_language.py

@@ -34,11 +34,7 @@ def run_ultravox(question: str, audio_count: int):
                                            tokenize=False,
                                            add_generation_prompt=True)
 
-    llm = LLM(model=model_name,
-              enforce_eager=True,
-              enable_chunked_prefill=False,
-              max_model_len=8192,
-              limit_mm_per_prompt={"audio": audio_count})
+    llm = LLM(model=model_name, limit_mm_per_prompt={"audio": audio_count})
     stop_token_ids = None
     return llm, prompt, stop_token_ids