Merge "fastboot: Add a few missing fastboot commands from help" am: 9a95ed928f am: 20be1caa69 am: 0b98decb24

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1673408

Change-Id: Ibaedd58671086d3743de31378d4ca25ceb55344c