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

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

Change-Id: I835aab0c8692e6c8b52715a3c1895a67d3800d24