Merge "Update retrofit_gki.sh for new init_boot plan" am: ac75382f8b am: 7782ab502d am: dd235e1a8f am: eba11b6120

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/1976890

Change-Id: I7664d2988ada64756661ac94a478d53b8bfb88d1