rust: scatterlist: Update ARef imports to use sync::aref

Update call sites in `scatterlist.rs` to import `ARef`
from `sync::aref` instead of `types`.

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

Suggested-by: Benno Lossin <lossin@kernel.org>
Link: https://github.com/Rust-for-Linux/linux/issues/1173
Signed-off-by: Shankari Anand <shankari.ak0208@gmail.com>
Link: https://patch.msgid.link/20251123092438.182251-8-shankari.ak0208@gmail.com
[ Change subject prefix to from 'kernel' to 'scatterlist'. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

rust/kernel/scatterlist.rs

@@ -38,7 +38,8 @@ use crate::{
     io::ResourceSize,
     page,
     prelude::*,
-    types::{ARef, Opaque},
+    sync::aref::ARef,
+    types::Opaque,
 };
 use core::{ops::Deref, ptr::NonNull};