[clang] [clang-tools-extra] [llvm] [clang] Simplify device kernel attributes (PR #137882)

[Aaron Ballman via llvm-commits]

https://github.com/AaronBallman approved this pull request.

This looks reasonable to me, but please wait for @erichkeane to sign off before landing

https://github.com/llvm/llvm-project/pull/137882