openeuler_defconfig: Enable CONFIG_ARM64_EPAN for ARM64

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QUF2



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Enable CONFIG_ARM64_EPAN for ARM64 architecture by default.

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