Update git submodules

* Update platform/system/update_engine from branch 'master'
  to 9b8a2bb050ff2a6beda02b9896f085798dca2d2a
  - Allow payload_metadata to take raw pointers with size
    
    This way, callers of payload_metadata don't have to store their data in
    std::vector. This makes parsing a `mmap()`ed payload file possible.
    While we don't need the ability to parse an mmap()ed payload on device,
    it is really handy for parsing payload from host-side tooling. In which
    case the entire payload will be available on disk anyway, and a
    streaming parse will complicate code a lot.
    
    Test: treehugger
    Change-Id: Icfbd8e849093c8f389ea802864680ab214bdd721
    
1 file changed