rust: prelude: re-export core::mem::{align,size}_of{,_val}

Rust 1.80.0 added:

    align_of
    align_of_val
    size_of
    size_of_val

from `core::mem` to the prelude [1].

For similar reasons, and to minimize potential confusion when code may
work in later versions but not in our current minimum, add it to our
prelude too.

Link: rust-lang/rust#123168 [1]
Link: https://lore.kernel.org/rust-for-linux/CANiq72kOLYR2A95o0ji2mDmEqOKh9e9_60zZKmgF=vZmsW6DRg@mail.gmail.com/ [2]
Reviewed-by: Alice Ryhl <[email protected]>
Reviewed-by: Alexandre Courbot <[email protected]>
Reviewed-by: Andreas Hindborg <[email protected]>
Reviewed-by: Daniel Almeida <[email protected]>
Reviewed-by: Benno Lossin <[email protected]>
Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

rust/kernel/prelude.rs

@@ -12,7 +12,10 @@
 //! ```
 
 #[doc(no_inline)]
-pub use core::pin::Pin;
+pub use core::{
+    mem::{align_of, align_of_val, size_of, size_of_val},
+    pin::Pin,
+};
 
 pub use ::ffi::{
     c_char, c_int, c_long, c_longlong, c_schar, c_short, c_uchar, c_uint, c_ulong, c_ulonglong,