[VitisAI] Remove 4k alignment from preferred allocator (#25447)
Short term solution for IO binding issue with `update_inplace` method of `OrtValue`.
### Description
With ORT 1.23 (main), there seem to be an issue with IOBind feature with 4k aligned preferred allocator.
Remove the 4k alignment requirement for now for a temp fix.
### Motivation and Context
- Fixes issues with IO Binding for few critical models.
- Will bring back 4k alignment when we have a appropriate fix in.