gpu: nova-core: vbios: store reference to Device where relevant

gpu: nova-core: vbios: store reference to Device where relevant

Now that the vbios code uses a non-bound `Device` instance, store an
`ARef` to it at construction time so we can use it for logging without
having to carry an extra argument on every method for that sole purpose.

Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://lore.kernel.org/r/20250808-vbios_device-v1-2-834bbbab6471@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>