build: pass version and patch level to mkbootimg

Add --os_version and --os_patch_level arguments to mkbootimg.

Needs matching changes from
  I57682611e0c27fec5ed284da7d9a788383ff98b1

Bug: 27498078
Bug: 22914603
Change-Id: I04e20b0de40d864aac92ac7bcf466a6cbde3d0e4
2 files changed