target/arm: Have cpu_isar_feature() use a const ARMCPU object

The @cpu_ variable is only accessed read-only, make it const.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20260202222412.24923-3-philmd@linaro.org>
1 file changed