target/arm: Convert aes and sm4 to gvec helpers

target/arm: Convert aes and sm4 to gvec helpers

With this conversion, we will be able to use the same helpers
with sve.  In particular, pass 3 vector parameters for the
3-operand operations; for advsimd the destination register
is also an input.

This also fixes a bug in which we failed to clear the high bits
of the SVE register after an AdvSIMD operation.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200514212831.31248-2-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>