unpack_bootimg: adding BootImageInfoFormatter am: 39b2d4fac9 am: 7a123c184c am: 94f84070e3 am: 25d783a5aa am: ad742b10ff

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

Change-Id: Ic4b4e9e9d8a2fa679aeee45732b6932b625c09f5