include/xscom: Remove duplicate p9 definitions
include/xscom: Remove duplicate p9 definitions

These are already defined in xscom-p9-regs.h

Signed-off-by: Oliver O'Halloran <3dfaff8fa6ae977f042064a112a6aac576279b9b@gmail.com>

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