target/arm: Use TRANS_FEAT for do_zpzzz_ool

Remove the DO_ZPZZZ macro, as it had just the two uses.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220527181907.189259-48-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>