hw/lpc: Configure SerIRQ interrupts on P9P
hw/lpc: Configure SerIRQ interrupts on P9P

We need to do the LPC SerIRQ mux configuration on P9P too. Without this
we don't get UART interrupts from the BMC which makes the UART console
*much* less responsive than it should be.

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

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