[llvm] [offload] Fix link issues when LLVM_LINK_LLVM_DYLIB on (PR #106583)

[via llvm-commits]

macurtis-amd wrote:

> I thought we did use `add_llvm_library`. We should probably just move the libraries there if so.

We do for `omptarget`. But not for libraries under `plugins-nextgen`.

The newly introduced failure is due to this transitive relationship:
```
omptarget -> PluginCommon -> LLVMProfileData
```




https://github.com/llvm/llvm-project/pull/106583