Merge "aconfig: update cpp codegen" into main

{{ if allow_instrumentation }}

{{ if readwrite- }}

#include <sys/stat.h>

#include <unistd.h>

#include "aconfig_storage/aconfig_storage_read_api.hpp"

#include <android/log.h>

#define LOG_TAG "aconfig_cpp_codegen"

            , flag_value_file_(nullptr)

            , read_from_new_storage_(false) \{

            struct stat buffer;

            if (stat("/metadata/aconfig/boot/enable_only_new_storage", &buffer) == 0) \{

            if (access("/metadata/aconfig/boot/enable_only_new_storage", F_OK) == 0) \{

               read_from_new_storage_ = true;

            }