unpack_bootimg: adding BootImageInfoFormatter am: 39b2d4fac9 am: 7a123c184c am: 94f84070e3 am: 25d783a5aa am: b5c59fdb7a am: 30c263a62f

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/1687707

Change-Id: I840cd336d4f9b34ac689a6ca8807585bbc1a6541