[clang] [Driver][NFC] Show SYCL support in -Xarch_device/host help text (PR #165503)

[Alexey Bader via cfe-commits]

bader wrote:

> The driver code handling -Xarch_device/host doesn't do specific things to SYCL or CUDA, HIP : https://github.com/llvm/llvm-project/blob/main/clang/lib/Driver/Compilation.cpp#L58

Considering that, I suggest we don't specify the offloading models. Let's align the help text with the implementation and make it generic by removing mentions of CUDA/HIP/SYCL.

https://github.com/llvm/llvm-project/pull/165503