gpu: nova-core: add delimiter for helper rules in register!() macro

This macro is pretty complex, and most rules are just helper, so add a
delimiter to indicate when users only interested in using it can stop
reading.

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://lore.kernel.org/r/20250619-nova-frts-v6-7-ecf41ef99252@nvidia.com


Signed-off-by: Danilo Krummrich <dakr@kernel.org>