Merge "repack_bootimg: changes the default path of --ramdisk_add" am: c1d56bbd1b am: bca59d92ab

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/1688291

Change-Id: Ide881bf7fdf08d535b9558e1a97411a66ee3ce36