hw/intc/loongarch_pch: Add kernel irqchip save and restore function

Add save and store funtction if kvm_irqchip_in_kernel() return true,
it is to get and set PCH PCI irqchip state from KVM kernel.

Reviewed-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Message-ID: <20250606063033.2557365-9-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
4 files changed