xive: Add basic opal_xive_reset() call and exploitation mode
xive: Add basic opal_xive_reset() call and exploitation mode

This adds an opal_xive_reset() call that currently does nothing
other than store the mode (emulation vs. exploitation), and
returns the appropriate error code if emulation mode calls are
done while in exploitation mode.

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

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