hw/intc/loongarch_extioi: Add extioi interrupt status display When irqchip in kernel is enabled, the register status of extioi irqchip is in KVM kernel. Here add interrupt status display in user side in order to debug extioi irqchip driver. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Reviewed-by: Xianglai Li <lixianglai@loongson.cn>