target/arm: Reject add/sub w/ shifted byte early

Remove the unparsed extractions in trans_ADD_zzi, trans_SUBR_zzi,
and do_zzi_sat which are intended to reject an 8-bit shift of an
8-bit constant for 8-bit element.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220527181907.189259-73-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>