rust: mm: update ARef and AlwaysRefCounted imports from sync::aref

Update call sites in the mm subsystem to import `ARef` and
`AlwaysRefCounted` from `sync::aref` instead of `types`.

This aligns with the ongoing effort to move `ARef` and `AlwaysRefCounted`
to sync.

Link: https://lkml.kernel.org/r/20250716091158.812860-1-shankari.ak0208@gmail.com
Signed-off-by: Shankari Anand <shankari.ak0208@gmail.com>
Suggested-by: Benno Lossin <lossin@kernel.org>
Link: https://github.com/Rust-for-Linux/linux/issues/1173
Acked-by: Alice Ryhl <aliceryhl@google.com>
Cc: Alex Gaynor <alex.gaynor@gmail.com>
Cc: Andreas Hindborg <a.hindborg@kernel.org>
Cc: Björn Roy Baron <bjorn3_gh@protonmail.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Gary Guo <gary@garyguo.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Trevor Gross <tmgross@umich.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

rust/kernel/mm.rs

@@ -13,7 +13,8 @@
 
 use crate::{
     bindings,
-    types::{ARef, AlwaysRefCounted, NotThreadSafe, Opaque},
+    sync::aref::{ARef, AlwaysRefCounted},
+    types::{NotThreadSafe, Opaque},
 };
 use core::{ops::Deref, ptr::NonNull};
 

rust/kernel/mm/mmput_async.rs

@@ -10,7 +10,7 @@
 use crate::{
     bindings,
     mm::MmWithUser,
-    types::{ARef, AlwaysRefCounted},
+    sync::aref::{ARef, AlwaysRefCounted},
 };
 use core::{ops::Deref, ptr::NonNull};