[llvm] [NVPTX] Add family-specific architectures support (PR #141899)

[Rajat Bajpai via llvm-commits]

rajatbajpai wrote:

@Artem-B @durga4github Could you please approve this MR? The latest revision contains minor change in `NVPTXSubtarget.h` file, so please take a look at it before approving. Thanks!

https://github.com/llvm/llvm-project/pull/141899