mambo: Enable XER CA32 and OV32 bits on P9
mambo: Enable XER CA32 and OV32 bits on P9

POWER9 adds 32 bit carry and overflow bits to the XER, but we need to
set the relevant CTRL1 bit to enable them.

Signed-off-by: Anton Blanchard <14deb5e5e417133e888bf47bb6a3555c9bb7d81c@samba.org>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.ibm.com>

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