gpu: nova-core: fix up formatting after merge

In the merge 260f6f4f ("Merge tag 'drm-next-2025-07-30' of
https://gitlab.freedesktop.org/drm/kernel"

), the formatting in the
conflict resolution doesn't match what `make rustfmt` wants to make it.

Fix it up appropriately.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>