[BugFix] Revert ROCm Custom Paged Attention Env Flag Check (#17022)

Signed-off-by: vllmellm <vllm.ellm@embeddedllm.com>

vllm/platforms/rocm.py

@@ -118,6 +118,7 @@ def use_rocm_custom_paged_attention(qtype: torch.dtype, head_size: int,
             and (head_size == 64 or head_size == 128)
             and (block_size == 16 or block_size == 32)
             and (gqa_ratio >= 1 and gqa_ratio <= 16) and max_seq_len <= 32768
+            and (envs.VLLM_ROCM_CUSTOM_PAGED_ATTN)
             and not (envs.VLLM_ROCM_USE_AITER_PAGED_ATTN
                      and envs.VLLM_ROCM_USE_AITER))