gpu: nova-core: fix bounds check in PmuLookupTableEntry::new

gpu: nova-core: fix bounds check in PmuLookupTableEntry::new

data is sliced from 2..6, but the bounds check data.len() < 5
does not satisfy those bounds.

Fixes: 47c4846e4319 ("gpu: nova-core: vbios: Add support for FWSEC ucode extraction")
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Rhys Lloyd <krakow20@gmail.com>
Link: https://lore.kernel.org/r/20250713025108.9364-2-krakow20@gmail.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>