[VitisAI] Update the order of deregister op (#24576)
### Description
after deinitialize_onnxruntime_vitisai_ep, s_domains_vitisaiep will be incorrect, which may cause an exception
### Motivation and Context
Put deregister_xir_ops() before deinitialize_onnxruntime_vitisai_ep() to avoid dangling pointers
Co-authored-by: GenMing Zhong <GenMing.Zhong@amd.com>
