samples: rust: debugfs: Update ARef imports to use sync::aref

samples: rust: debugfs: Update ARef imports to use sync::aref

Update call sites in `rust_debugfs.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/20251123092438.182251-10-shankari.ak0208@gmail.com
[ Add 'debugfs' to the commit subject; be consistent with the existing
  import style for now. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>