gpu: nova-core: fb: use dma::CoherentHandle
Replace the nova-core local `DmaObject` with a `CoherentHandle` that can
fulfill the same role.
Reviewed-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patch.msgid.link/20260327-b4-nova-dma-removal-v2-5-616e1d0b5cb3@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>