diffusers

ade1059a - [Flux.1] improve pos embed for ascend npu by computing on npu (#12897)

[Flux.1] improve pos embed for ascend npu by computing on npu (#12897) * [Flux.1] improve pos embed for ascend npu by setting it back to npu computation. * [Flux.2] improve pos embed for ascend npu by setting it back to npu computation. * [LongCat-Image] improve pos embed for ascend npu by setting it back to npu computation. * [Ovis-Image] improve pos embed for ascend npu by setting it back to npu computation. * Remove unused import of is_torch_npu_available --------- Co-authored-by: zhangtao <zhangtao529@huawei.com>