[Voxtral TTS] Correct decode steps param in Voxtral TTS (#2524)

Signed-off-by: Chen-Yo Sun <chenyo.sun@mistral.ai>

tests/model_executor/models/voxtral_tts/test_cuda_graph_acoustic_transformer.py

@@ -78,6 +78,13 @@ except Exception:
     AudioSpecialTokens = _mod2.AudioSpecialTokens
 
 
+class SyntheticAcousticTransformerArgs:
+    """Mimics AcousticTransformerArgs interface."""
+
+    def __init__(self):
+        self.n_decoding_steps = 7
+
+
 class SyntheticModelArgs:
     """Mimics MultimodalAudioModelArgs interface."""
 
@@ -96,6 +103,7 @@ class SyntheticAcousticTransformer(nn.Module):
     def __init__(self):
         super().__init__()
         self.model_args = SyntheticModelArgs()
+        self.acoustic_transformer_args = SyntheticAcousticTransformerArgs()
         self.acoustic_embeddings_levels = ACOUSTIC_EMBEDDINGS_LEVELS
 
         # semantic_codebook_output: hidden_dim -> padded_codebook_size