mkbootimg: add os_version
am: 05d2a9002e

* commit '05d2a9002ef3509efd1a1ab2ebf0a86561e61607':
  mkbootimg: add os_version
tree: 85ddfe090378318de9f9bbe0bd06cc44da11bead
  1. Android.mk
  2. bootimg.h
  3. mkbootimg