AMD CI Test - unskip moe_sum test and moe_align_block_size tests (#32039)

Signed-off-by: Hongxia Yang <hongxia.yang@amd.com>

vllm/platforms/rocm.py

@@ -187,6 +187,17 @@ class RocmPlatform(Platform):
     if not on_gfx9():
         supported_quantization += ["bitsandbytes"]
 
+    @classmethod
+    def import_kernels(cls) -> None:
+        """Import ROCm-specific kernels."""
+        super().import_kernels()
+
+        import contextlib
+
+        # Import ROCm-specific extension
+        with contextlib.suppress(ImportError):
+            import vllm._rocm_C  # noqa: F401
+
     @classmethod
     def get_attn_backend_cls(
         cls,