[CI][AMD] Match Main CI Behavior By Skipping test_eplb_spec_decode In AMD CI (#30006)

Signed-off-by: Micah Williamson <micah.williamson@amd.com>

tests/distributed/test_eplb_spec_decode.py

@@ -6,6 +6,7 @@ import lm_eval
 import pytest
 
 from tests.utils import large_gpu_mark
+from vllm.platforms import current_platform
 
 
 def get_model_args(
@@ -45,6 +46,12 @@ def get_model_args(
     return model_args
 
 
+pytestmark = pytest.mark.skipif(
+    current_platform.is_rocm(),
+    reason="EPLB with Spec Decode is a work in progress on ROCm.",
+)
+
+
 @pytest.mark.parametrize(
     "model_setup",
     [