nvbios: Fix reading of ram_restrict_group_count.

The entry offset was use instead of the data it points to. Probably a regression.
The files showing script parsing errors has been reduced from 410 to 6 with the database of 505 vbios.
nvbios: Truncate nb of entries to avoid displaying garbage

We return an error but this does not prevent the display so just make sure only valid data are printed.
nvamemtiming: Make deep mode take range into account and treat range end as included