[clang] [CUDA] Rename SM_32 to SM_32_ to work around AIX headers (PR #88779)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Other than that nit, LGTM (leaving final approval to @Artem-B )

https://github.com/llvm/llvm-project/pull/88779