target/arm: Add secure parameter to pmsav8_mpu_lookup

Remove the use of regime_is_secure from pmsav8_mpu_lookup,
passing the new parameter to the lookup instead.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220822152741.1617527-13-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>