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Add ucall test support for LoongArch, ucall method on LoongArch uses undefined mmio area. It will cause vCPU exiting to hypervisor so that hypervisor can communicate with vCPU. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>