Revert "irqchip/gic-v3-its: Balance initial LPI affinity across CPUs"

commit ae9f41b6405f01df397c5591cfdb2d2d77a060a8 from
git@git.assembla.com:cavium/WindRiver.linux.git

While mapping the LPI interrupt, ITS driver picks the first possible
affinity, which is in most cases CPU0. Since most of the irqs are binded
cpu0. The original patch distribute the irq across online cpus.
But this might break the task isolation feature. Hence reverting the patch.

This reverts commit c5d6082d.

Change-Id: I7ecef36476f16e8b82ad8b9eff3e54c139f5dea1
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/99222


Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Tested-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/99352


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Devapraba Muthumani <dmuthumani@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>