rust-analyzer: go to definition for `bindings::*` for out of tree builds

Go to definition via rust-analyzer with the configuration generated by `make rust-analyzer` is not working for out of tree builds `make O=...`.

Probably related to https://github.com/rust-lang/rust-analyzer/issues/15836 and not our fault. Opening the issue to track.

\[ @gipsyh reported https://github.com/Rust-for-Linux/linux/issues/829. - Miguel \]