[bugfix] add supports_v1 platform interface (#15417)

Signed-off-by: Joe Runde <Joseph.Runde@ibm.com>

vllm/engine/arg_utils.py

@@ -1666,9 +1666,8 @@ class EngineArgs:
             _raise_or_fallback(feature_name=name, recommend_to_remove=True)
             return False
 
-        # No support for device type other than CUDA, AMD (experiemntal) or
-        # TPU (experimental) so far.
-        if not (current_platform.is_cuda_alike() or current_platform.is_tpu()):
+        # Platforms must decide if they can support v1 for this model
+        if not current_platform.supports_v1(model_config=model_config):
             _raise_or_fallback(
                 feature_name=f"device type={current_platform.device_type}",
                 recommend_to_remove=False)