openeuler_defconfig: Enable Phytium FT-2500 support by default

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


CVE: NA

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While compiling with openeuler_defconfig, configs CONFIG_ARCH_PHYTIUM
and CONFIG_ARM_GIC_PHYTIUM_2500 should be set to enable support for
Phytium ARMv8 S2500/FT-2500 SoC and 2-Processor server.

Enable these two configs for arch/arm64/configs/openeuler_defconfig
by default.

Note: As FT-2500 2-Processor server has 16 NUMA nodes, CONFIG_NODES_SHIFT
should be 4.

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