gpu: nova-core: move GSP unload state to a pinned Gpu subobject

`Gpu` currently owns the state needed to unload the GSP directly. This
means that `unload_bundle` has to be the last initialized field: once GSP
boot succeeds, any later initialization failure would leave `Gpu`
partially initialized, and its `PinnedDrop` implementation would not run.

This prevents adding fallible `Gpu` fields that need to query the GSP
after it has booted.

Move the GSP state and unload bundle into a dedicated pinned
`GspResources` object. Once that subobject has been initialized, its
`PinnedDrop` implementation will run even if initialization of a later
`Gpu` field fails, ensuring that the GSP unload sequence is executed.

Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Link: https://patch.msgid.link/20260617-boot-vram-v3-1-20b9ec5fe9f2@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

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