[fpv] update regression items
[fpv] update regression items

Update FPV regression items:
1. Remove the ones that already had a DV testbench (The generated FPV
csr assertions does not work for FPV fusesoc)
2. Add sha3pad_fpv and prim_arbiter_fixed_fpv to regression

Signed-off-by: Cindy Chen <399ad771a111eac8923348b1e2af093034e5d4f1@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan