core/cpu: remove POWER8 IPI loop
core/cpu: remove POWER8 IPI loop

POWER8 does not have to loop sending IPIs until the destination wakes
up. cpu_wake() only sends IPI so that should be enough here too.

This will help the next patch make a common IPI sending function.

Signed-off-by: Nicholas Piggin <24829078df5003d9dd1dd871ca2aeb0b1cf95ef4@gmail.com>
Signed-off-by: Cédric Le Goater <2d8cace2254d4e43578d21933db015d84bcc468a@kaod.org>

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