Revert "Revert "Add Android.bp to build U-Boot's mkimage.""

This reverts commit eecec8d4589fdb3529f5f8a9c663ab702b103141.

Reason for revert: cause of failure has been resolved

Change-Id: Ic1049389d7b69eb068be46c3a8b8b01d9813f228
25 files changed