target/arm: Update REV, PUNPK for pred_desc

Update all users of do_perm_pred2 for the new
predicate descriptor field definitions.

Cc: qemu-stable@nongnu.org
Buglink: https://bugs.launchpad.net/bugs/1908551


Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210113062650.593824-5-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>