[EPLB][ROCm]: support EPBL for ROCm backend (#27731)

Signed-off-by: Perry Zhang <perzhang@amd.com>
Co-authored-by: Perry Zhang <perzhang@amd.com>

vllm/config/parallel.py

@@ -278,10 +278,10 @@ class ParallelConfig:
             )
 
         if self.enable_eplb:
-            if not current_platform.is_cuda():
+            if not current_platform.is_cuda_alike():
                 raise ValueError(
                     "Expert parallelism load balancing is only supported on "
-                    "CUDA devices now."
+                    "CUDA devices or ROCm devices now."
                 )
             if not self.enable_expert_parallel:
                 raise ValueError("enable_expert_parallel must be True to use EPLB.")