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

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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: NZhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: NJiahao Chen <chenjiahao16@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/include/asm/processor.h

@@ -9,12 +9,8 @@
 #define __ASM_PROCESSOR_H
 
 #define KERNEL_DS		UL(-1)
-#ifdef CONFIG_COMPAT
 #define USER_DS			(is_compat_task() ? \
 				(UL(0x100000000) - 1) : (TASK_SIZE - 1))
-#else
-#define USER_DS			(TASK_SIZE - 1)
-#endif
 
 /*
  * On arm64 systems, unaligned accesses by the CPU are cheap, and so there is