[ROCm][Critical] Fix the GDN import bug (#43486)

Signed-off-by: tjtanaa <tunjian.tan@embeddedllm.com>

tests/compile/passes/test_fusion.py

@@ -521,7 +521,7 @@ class _MockGDNLayer:
         self.head_v_dim = head_v_dim
         self.tp_size = tp_size
 
-        from vllm.model_executor.layers.mamba.gdn_linear_attn import (
+        from vllm.model_executor.layers.mamba.gdn.base import (
             GatedDeltaNetAttention,
         )
 

vllm/compilation/passes/fusion/rocm_aiter_fusion.py

@@ -560,11 +560,14 @@ class RocmAiterRMSNormQuantFusionPass(VllmPatternMatcherPass):
 
         # Discover (num_heads, head_dim) pairs for gated RMSNorm patterns
         # from GatedDeltaNetAttention layers in static_forward_context.
-        from vllm.model_executor.layers.mamba.gdn_linear_attn import (
+        from vllm.model_executor.layers.mamba.gdn.base import (
             GatedDeltaNetAttention,
         )
 
-        gdn_layers = get_layers_from_vllm_config(config, GatedDeltaNetAttention)
+        gdn_layers = get_layers_from_vllm_config(
+            config,
+            GatedDeltaNetAttention,  # type: ignore[type-abstract]
+        )
         gated_norm_shapes: set[tuple[int, int]] = set()
         for layer in gdn_layers.values():
             gated_norm_shapes.add(