rust: device: implement device context marker

Some bus device functions should only be called from bus callbacks,
such as probe(), remove(), resume(), suspend(), etc.

To ensure this add device context marker structs, that can be used as
generics for bus device implementations.

Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Suggested-by: Benno Lossin <benno.lossin@proton.me>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/20250314160932.100165-3-dakr@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>