null: Claim to use 64 bit floating point registers.

The NULL ISA doesn't actually have registers, so this setting doesn't
matter. By making it 64 bits the ISA is more compatible with the other
ISAs.

Change-Id: I2c9b6d9a6f612719b8b00eb9dbed55fa2159e9b5
Reviewed-on: https://gem5-review.googlesource.com/c/13617
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
1 file changed