[llvm] [SPIRV] Do not remove capability from all caps (PR #68194)

[Ilia Diachkov via llvm-commits]

iliya-diyachkov wrote:

> I initially added this code but I think I misinterpreted the purpuse of AvailableCaps.
Well, we had to use `AllCaps` instead of `AvailableCaps`.

https://github.com/llvm/llvm-project/pull/68194