X86/config: Enable CONFIG_USERSWAP

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I40AXF


CVE: NA

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Enable CONFIG_USERSWAP for openeuler_defconfig

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