Fix an unused parameter error when building on devices where __i386__ and __x86_64__ are not defined. BUG=none TEST=none Change-Id: I6c04c8e7b931565c87d358aac1025ebcb7617b13 Signed-off-by: Nick Vaccaro <nvaccaro@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/63880 Reviewed-by: Julius Werner <jwerner@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>