x86: Remove __USER32_DS

Replace all users with the equivalent __USER_DS, which will make merging
native and compat code simpler.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Link: https://lore.kernel.org/r/20220606203802.158958-5-brgerst@gmail.com


Signed-off-by: Borislav Petkov <bp@suse.de>