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

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

Change-Id: Ibd204f90688fb192bed9ce95fb2f1a85cd2892f2