rust: drm: Update AlwaysRefCounted imports to use sync::aref

rust: drm: Update AlwaysRefCounted imports to use sync::aref

Update call sites to import `AlwaysRefCounted`
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/20251123092438.182251-5-shankari.ak0208@gmail.com
Signed-off-by: Alice Ryhl <aliceryhl@google.com>