gpu: nova-core: firmware: add ucode descriptor used by FWSEC-FRTS

FWSEC-FRTS is the first firmware we need to run on the GSP falcon in
order to initiate the GSP boot process. Introduce the structure that
describes it.

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://lore.kernel.org/r/20250619-nova-frts-v6-16-ecf41ef99252@nvidia.com


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