[ROCm][Bugfix] Only enable +rms_norm based on aiter if not explicitly disabled (#25275)

Signed-off-by: Gregory Shtrasberg <Gregory.Shtrasberg@amd.com>

vllm/platforms/rocm.py

@@ -340,7 +340,8 @@ class RocmPlatform(Platform):
                 else:
                     parallel_config.worker_cls = "vllm.worker.worker.Worker"
         #  Aiter rms norm perform best when CUDA Graph capture is enabled.
-        if use_v1 and use_aiter_rms_norm and not is_eager_execution:
+        if (use_v1 and use_aiter_rms_norm and not is_eager_execution
+                and "-rms_norm" not in compilation_config.custom_ops):
             compilation_config.custom_ops.append("+rms_norm")
 
     @classmethod