[Rocm][CI] Fix DeekSeek V2-Lite Accuracy CI (#29135)

Signed-off-by: charlifu <charlifu@amd.com>

.buildkite/scripts/scheduled_integration_test/deepseek_v2_lite_ep_eplb.sh

@@ -17,7 +17,17 @@ wait_for_server() {
 }
 
 MODEL="deepseek-ai/DeepSeek-V2-lite"
-BACKENDS=("deepep_high_throughput" "deepep_low_latency")
+
+# Set BACKENDS based on platform
+if command -v rocm-smi &> /dev/null || [[ -d /opt/rocm ]] || [[ -n "${ROCM_PATH:-}" ]]; then
+  # ROCm platform
+  BACKENDS=("allgather_reducescatter")
+  # Disable MOE padding for ROCm since it is causing eplb to fail
+  export VLLM_ROCM_MOE_PADDING=0
+else
+  # Non-ROCm platform (CUDA/other)
+  BACKENDS=("deepep_high_throughput" "deepep_low_latency")
+fi
 
 cleanup() {
   if [[ -n "${SERVER_PID:-}" ]] && kill -0 "${SERVER_PID}" 2>/dev/null; then

.buildkite/scripts/scheduled_integration_test/qwen30b_a3b_fp8_block_ep.sh

@@ -17,7 +17,16 @@ wait_for_server() {
 }
 
 MODEL="QWen/Qwen3-30B-A3B-FP8"
-BACKENDS=("deepep_high_throughput" "deepep_low_latency")
+# Set BACKENDS based on platform
+if command -v rocm-smi &> /dev/null || [[ -d /opt/rocm ]] || [[ -n "${ROCM_PATH:-}" ]]; then
+  # ROCm platform
+  BACKENDS=("allgather_reducescatter")
+  # Disable MOE padding for ROCm since it is causing eplb to fail
+  export VLLM_ROCM_MOE_PADDING=0
+else
+  # Non-ROCm platform (CUDA/other)
+  BACKENDS=("deepep_high_throughput" "deepep_low_latency")
+fi
 
 cleanup() {
   if [[ -n "${SERVER_PID:-}" ]] && kill -0 "${SERVER_PID}" 2>/dev/null; then