Use unoptimized RMSNorm kernel if pointers are not aligned

[timmoon10]

Description

The optimimzed RMSNorm kernels access data with vectorized loads/stores, and can thus experience alignment issues if the data pointers are misaligned (e.g. they are views within a larger buffer). This PR falls back to unoptimized kernels (with entry-wise memory accesses) if data pointers are not aligned.

This is the same fix as https://github.com/NVIDIA/TransformerEngine/pull/490.

Type of change

• [ ] Documentation change (change only to the documentation, either a fix or a new content)
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Changes

• Use unoptimized RMSNorm kernel if pointers are not aligned

Checklist:

• [x] I have read and followed the contributing guidelines
• [x] The functionality is complete
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

[timmoon10]

/te-ci

[phu0ngng]

LGTM! Would you like to add a unit test for this as well?