RISC-V does not have the kind of I/O space that x86 has. Other
architectures tend to leave out these definitions as well.
Change-Id: I7328dae1f1fa4ef8772750244a0b11a3fa5aa88f
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/25566
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>