xive: Spread the notification ports a bit
xive: Spread the notification ports a bit

There are 4 snoopers, 0 and 3 are pretty busy, so let's use a mix
of 1 and 2 for the PHB and PSI notification ports. We do that by
using different cache line offsets. We use 1 for PHB0 which tends
to be the highest performance one and 2 for everybody else

Signed-off-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

legoater/skiboot,mikey/skiboot,shenki/skiboot,legoater/skiboot,open-power/skiboot,open-power/skiboot,qemu/skiboot,stewart-ibm/skiboot,qemu/skiboot,qemu/skiboot,shenki/skiboot,legoater/skiboot,stewart-ibm/skiboot,mikey/skiboot,open-power/skiboot,shenki/skiboot,legoater/skiboot,legoater/skiboot,shenki/skiboot,stewart-ibm/skiboot,qemu/skiboot,open-power/skiboot,open-power/skiboot,mikey/skiboot,qemu/skiboot,shenki/skiboot