gpu: nova-core: falcon: rename load parameters to reflect DMA dependency

gpu: nova-core: falcon: rename load parameters to reflect DMA dependency

The current `FalconLoadParams` and `FalconLoadTarget` types are fit for
DMA loading, but not so much for PIO loading which will require its own
types. Start by renaming them to something that indicates that they are
indeed DMA-related.

Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patch.msgid.link/20260306-turing_prep-v11-3-8f0042c5d026@nvidia.com
[acourbot@nvidia.com: fixup order of import items.]
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>