Revert "arm64: fix USER_DS definition problem in non-compat mode"

hulk inclusion
category: performance
bugzilla: https://e.gitee.com/open_euler/issues/list?issue=I4SCW7


CVE: NA

-------------------------------------------------------------------------

This reverts commit 97cb3288.

The macro 'USER_DS' and related assembly code is deleted by
commit 3d2403fd ("arm64: uaccess: remove set_fs()", so the
problem fixed by this patch is disappeared accordingly.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Jiahao Chen <chenjiahao16@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>