irqchip/gic-phytium-2500: Add support for GIC of Phytium S2500

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I41AUQ


CVE: NA

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Phytium S2500 adjusts the GIC's implementation to support multi-socket
system designs. This patch adds the driver of this new implementation
while keeping the kernel binary compatible with other ARM servers
in the ecosystem.

Signed-off-by: Wang Yinfeng <wangyinfeng@phytium.com.cn>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>