irqchip/mips-gic: Replace open coded online CPU iterations

irqchip/mips-gic: Replace open coded online CPU iterations

Several places in the MIPS GIC driver iterate over the online CPUs to
operate on the CPU's GIC local register block, accessed via the GIC's
other/redirect register block.

Abstract the process of iterating over online CPUs & configuring the
other/redirect region to access their registers through a new
for_each_online_cpu_gic() macro and convert all usage sites over.

Signed-off-by: Paul Burton <paulburton@kernel.org>
Signed-off-by: Chao-ying Fu <cfu@wavecomp.com>
Signed-off-by: Dragan Mladjenovic <dragan.mladjenovic@syrmia.com>
Signed-off-by: Aleksandar Rikalo <arikalo@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Tested-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/all/20241028175935.51250-2-arikalo@gmail.com