onnxruntime

Fix issues on Windows for Vitis AI (#15810)

### Description
Fix two errors that is only encountered on windows


### Motivation and Context
For onnxruntime::VitisAIProviderFactoryCreator::Create, it would cause
the compile error.
For if (it == provider_options_map.end()), it would cause an error but
execute as normal

Co-authored-by: Zhang <yueqingz@amd.com>