sim: use flash_area_get_sectors()

Use the new flash sector API by default when testing.

Signed-off-by: Marti Bolivar <marti.bolivar@linaro.org>

sim/build.rs

@@ -19,6 +19,7 @@ fn main() {
     conf.flag("-Wall");
     conf.define("__BOOTSIM__", None);
     // conf.define("MCUBOOT_OVERWRITE_ONLY", None);
+    conf.define("MCUBOOT_USE_FLASH_AREA_GET_SECTORS", None);
     conf.compile("libbootutil.a");
     walk_dir("../boot").unwrap();
     walk_dir("csupport").unwrap();