plugins/api.c: Use cpu_translate_for_debug()

We want to remove the cpu_get_phys_addr_debug() function; update the
plugin code to use cpu_translate_for_debug() instead.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20260430093810.2762539-25-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>