rust: kernel: sort Rust modules

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

This makes `rustfmtcheck` to pass again.

Fixes: 5701725 ("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>

Author: ojeda

rust/kernel/lib.rs

@@ -44,8 +44,8 @@ pub mod net;
 pub mod page;
 pub mod prelude;
 pub mod print;
-pub mod sizes;
 pub mod rbtree;
+pub mod sizes;
 mod static_assert;
 #[doc(hidden)]
 pub mod std_vendor;