target/arm: Move sve check into gen_gvec_fn_ppp

Combined with the check already present in gen_mov_p,
we can simplify some special cases in trans_AND_pppp
and trans_BIC_pppp.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220527181907.189259-80-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>