[AIX] Build fix for using system installed protobuf/onnx (#22272)
### Description
To fix the build issues for AIX OS while using system installed
protobuf/onnx.
### Motivation and Context
Code changes in this PR contains:
1. Fix for below compilation issue.
```
collect2: fatal error: library liblibprotobuf-lite not found
compilation terminated.
```
2. Adding onnx library into dependency list for test applicaitons.