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

rust/bindings/bindings_helper.h

@@ -12,10 +12,10 @@
 #include <linux/jiffies.h>
 #include <linux/mdio.h>
 #include <linux/phy.h>
-#include <linux/slab.h>
 #include <linux/refcount.h>
-#include <linux/wait.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
 #include <linux/workqueue.h>
 
 /* `bindgen` gets confused at certain things. */