[Misc]Reduce BNB static variable (#9987)

Signed-off-by: Jee Jee Li <pandaleefree@gmail.com>

vllm/model_executor/models/gemma2.py

@@ -390,8 +390,6 @@ class Gemma2ForCausalLM(nn.Module, SupportsLoRA, SupportsPP):
         ".v_proj.",
         ".o_proj.",
     ]
-    # in TP, these weights are partitioned along the column dimension (dim=-1)
-    column_parallel_weights_modules = [".down_proj.", ".o_proj."]
     bitsandbytes_stacked_params_mapping = {
         # shard_name, weight_name, index
         "q_proj": ("qkv_proj", 0),