rust: kernel: sort Rust modules

Rust modules are intended to be sorted, thus do so.

This makes `rustfmtcheck` to pass again.

Fixes: 57017256 ("Merge tag 'rust-6.12' of https://github.com/Rust-for-Linux/linux"

)
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20240926124751.345471-1-ojeda@kernel.org


Signed-off-by: Miguel Ojeda <ojeda@kernel.org>