Merge master@272c568166 into kernel.build.lnx.1.0

https://android.googlesource.com/platform/system/tools/mkbootimg

:
  mkbootimg changes for bootconfig
  mkbootimg: chmod +x mkbootimg.py
  py2 to py3 conversion and style fix
  [LSC] Add LOCAL_LICENSE_KINDS to system/tools/mkbootimg
  Adding repack_bootimg.py
  unpack_bootimg: saves mkbootimg arguments to a .json file
  Add vendor ramdisk name to vendor_boot v4
  Update OWNERS
  Add assemble_cvd to com.android.virt
  Add mkbootimg_test
  unpack_bootimg: support boot image version 4
  mkbootimg: support boot image version 4
  Add boot / vendor boot image header version 4
  Allow empty --kernel.

Change-Id: I88b423bf0f36e096c316cbdde4b2b94b38a306f4
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>