[ImageGPT] Deprecate pixel_values input name to input_ids (#14801)
* [ImageGPT] Deprecate pixel_values input name to input_ids
* up
* Apply suggestions from code review
Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>
* correct
* finish
Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>