Refactor sepolicy.rules resolve native

Co-authored-by: LoveSy <shana@zju.edu.cn>

native/src/base/files.hpp

@@ -107,6 +107,7 @@ void frm_rf(int dirfd);
 void clone_dir(int src, int dest);
 std::vector<mount_info> parse_mount_info(const char *pid);
 std::string find_apk_path(const char *pkg);
+std::string find_rules_dir(const char *base_dir);
 
 using sFILE = std::unique_ptr<FILE, decltype(&fclose)>;
 using sDIR = std::unique_ptr<DIR, decltype(&closedir)>;