arch-arm: Replace NumFloatV8ArchRegs with NumVecV8ArchRegs

gem5-ARM is not using floatRegs anymore and moved towards the
vecRegs register file (which is used for SIMD&FP + SVE instructions)

Change-Id: I41cfbe10565e4e0db838f98626310a5b14edadb9
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23103
Tested-by: kokoro <noreply+kokoro@google.com>
3 files changed