Convert SVE translation functions using do_sve2_zzzz_fn
to use TRANS_FEAT and gen_gvec_fn_arg_zzzz.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220527181907.189259-38-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>