target/s390x: Always use cpu_atomic_cmpxchgl_be_mmu in do_csst

Eliminate the CONFIG_USER_ONLY specialization.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
1 file changed