rust: driver: add DriverData type to the DriverLayout trait Add an associated type DriverData to the DriverLayout trait indicating the type of the driver's device private data. Acked-by: Alice Ryhl <aliceryhl@google.com> Acked-by: Igor Korotin <igor.korotin.linux@gmail.com> Link: https://patch.msgid.link/20260107103511.570525-6-dakr@kernel.org Signed-off-by: Danilo Krummrich <dakr@kernel.org>