Mynewt: compile time indicator telling that using new img format.

Signed-off-by: Marko Kiiskila <marko@runtime.io>
Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/boot/mynewt/mcuboot_config/syscfg.yml b/boot/mynewt/mcuboot_config/syscfg.yml
index a8087f7..574aa37 100644
--- a/boot/mynewt/mcuboot_config/syscfg.yml
+++ b/boot/mynewt/mcuboot_config/syscfg.yml
@@ -43,3 +43,6 @@
     BOOTUTIL_OVERWRITE_ONLY:
         description: 'Non-swapping upgrades, copy from slot 1 to slot 0 only.'
         value: 0
+    BOOTUTIL_IMAGE_FORMAT_V2:
+        description: 'Indicates that system is using v2 of image format'
+        value: 1