rust: bindings: Order headers alphabetically

As the comment on top of the file suggests, sort the headers
alphabetically.

No functional changes.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://github.com/Rust-for-Linux/linux/issues/1002
Link: https://lore.kernel.org/r/20240216152723.993445-1-mika.westerberg@linux.intel.com


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