rust: kernel: sort features

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

Author: ojeda

rust/kernel/lib.rs

@@ -14,20 +14,20 @@
 #![no_std]
 #![feature(allocator_api)]
 #![feature(associated_type_defaults)]
+#![feature(coerce_unsized)]
 #![feature(const_mut_refs)]
 #![feature(const_ptr_offset_from)]
 #![feature(const_refs_to_cell)]
 #![feature(const_trait_impl)]
 #![feature(core_ffi_c)]
 #![feature(c_size_t)]
+#![feature(dispatch_from_dyn)]
 #![feature(doc_cfg)]
+#![feature(duration_constants)]
 #![feature(generic_associated_types)]
 #![feature(ptr_metadata)]
 #![feature(receiver_trait)]
-#![feature(coerce_unsized)]
-#![feature(dispatch_from_dyn)]
 #![feature(unsize)]
-#![feature(duration_constants)]
 
 // Ensure conditional compilation based on the kernel configuration works;
 // otherwise we may silently break things like initcall handling.