scripts: generate_rust_analyzer: add uapi crate

Commit 4e174665 ("rust: uapi: Add UAPI crate") did not update
rust-analyzer to include the new crate.

Add the missing definition to improve the developer experience.

Fixes: 4e174665 ("rust: uapi: Add UAPI crate")
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Tested-by: Andreas Hindborg <a.hindborg@kernel.org>
Link: https://lore.kernel.org/r/20250210-rust-analyzer-bindings-include-v2-2-23dff845edc3@gmail.com


[ Slightly reworded title. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>