rust: prelude: add `pin-init` API items to prelude

Add `pin-init` API macros and traits to the prelude.

Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Link: https://lore.kernel.org/r/20230408122429.1103522-13-y86-dev@protonmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

rust/kernel/prelude.rs

@@ -18,7 +18,7 @@ pub use core::pin::Pin;
 pub use alloc::{boxed::Box, vec::Vec};
 
 #[doc(no_inline)]
-pub use macros::{module, vtable};
+pub use macros::{module, pin_data, pinned_drop, vtable};
 
 pub use super::build_assert;
 
@@ -27,8 +27,12 @@ pub use super::build_assert;
 pub use super::dbg;
 pub use super::{pr_alert, pr_crit, pr_debug, pr_emerg, pr_err, pr_info, pr_notice, pr_warn};
 
+pub use super::{init, pin_init, try_init, try_pin_init};
+
 pub use super::static_assert;
 
 pub use super::error::{code::*, Error, Result};
 
 pub use super::{str::CStr, ThisModule};
+
+pub use super::init::{InPlaceInit, Init, PinInit};