[llvm] [AMDGPU] Remove BaseInfo duplicates of TargetParser APIs (PR #226744)

[Chinmay Deshpande via llvm-commits]

chinmaydd wrote:

Actually, there's some more clean up that can be done here - especially w.r.t `getVGPREncodingGranule`, `getAddressableNumVGPRs` and `getVGPRAllocGranule`. Let me do that first

https://github.com/llvm/llvm-project/pull/226744