irqchip/loongarch: Fix some issues of irq controllers

LoongArch inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6ONTH



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In dual-bridges scenario, some bugs were found for irq
controllers drivers, so the patch is used to fix them.

Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Change-Id: Ib498432738a269543626f4e8cc5dc24aa12c4c47