[V1]SupportsV0Only protocol for model definitions (#13959)

Signed-off-by: Roger Wang <ywang@roblox.com>

vllm/model_executor/models/bamba.py

@@ -32,7 +32,8 @@ from vllm.model_executor.sampling_metadata import SamplingMetadata
 from vllm.sequence import IntermediateTensors
 from vllm.utils import LayerBlockType
 
-from .interfaces import HasInnerState, IsHybrid, SupportsLoRA, SupportsPP
+from .interfaces import (HasInnerState, IsHybrid, SupportsLoRA, SupportsPP,
+                         SupportsV0Only)
 from .utils import (is_pp_missing_parameter,
                     make_empty_intermediate_tensors_factory, make_layers,
                     maybe_prefix)
@@ -366,7 +367,7 @@ class BambaModel(nn.Module):
 
 
 class BambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA, SupportsPP,
-                       IsHybrid):
+                       IsHybrid, SupportsV0Only):
     packed_modules_mapping = {
         "qkv_proj": [
             "q_proj",