[Bugfix][llama4_eagle] Fix missing 'lm_head' attribute (#29926)

Signed-off-by: Divakar Verma <divakar.verma@amd.com>

tests/v1/e2e/test_spec_decode.py

@@ -402,7 +402,11 @@ def test_eagle_correctness(
             # Scout requires default backend selection
             # because vision encoder has head_dim 88 being incompatible
             #  with FLASH_ATTN and needs to fall back to Flex Attn
-            pass
+
+            # pass if not ROCm
+            if current_platform.is_rocm():
+                # TODO: Enable Flex Attn for spec_decode on ROCm
+                pytest.skip("Flex Attn for spec_decode not supported on ROCm currently")
         else:
             m.setenv("VLLM_MLA_DISABLE", "1")
             m.setenv("VLLM_ATTENTION_BACKEND", attn_backend)