repack_bootimg: Update --ramdisk_add usages am: b166bd7879 am: e8dd60790c am: 1f9c6ff74b am: a4eb1c5226 am: 57616bb6dd

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/1864426

Change-Id: I9bd6842068ec589a939a9fbd8f4eb070aef51b98