vitis ai support generic data type (#16902)
### Description
<!-- Describe your changes. -->
Support more data types for vitis ai.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
It is required because the models we are testing now have uint8 data
type. To solve this once for all, we changed the code to support generic
data type.
