target/arm: Simplify sve mte checking

target/arm: Simplify sve mte checking

Now that mte_check1 and mte_checkN have been merged, we can
merge sve_cont_ldst_mte_check1 and sve_cont_ldst_mte_checkN.

Which means that we can eliminate the function pointer into
sve_ldN_r and sve_stN_r, calling sve_cont_ldst_mte_check directly.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210416183106.1516563-9-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>