VP Fixes for converter + Config management
# What does this PR do ?

Fix an issue with VP parameter loading. 
NOTE: this is not a complete fix for VP, bugs are still being fixed in later PRs.

**Collection**: [NLP]

# Changelog 
- force config to be correctly updated for megatron amp 02
- update VP logic when loading weights

# Before your PR is "Ready for review"
**Pre checks**:
- [x] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [ ] Did you write any new necessary tests?
- [ ] Did you add or update any necessary documentation?
- [ ] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [ ] New Feature
- [x] Bugfix
- [ ] Documentation
