Update git submodules

* Update platform/external/perfetto from branch 'master'
  to b4c6054d3d64b7a0eda8c62e3ffff1a44dd48083
  - Merge "perfetto: switch sys stats counter to use proto lite not pzero"
  - perfetto: switch sys stats counter to use proto lite not pzero
    
    Using the pbzero variant pulls in protozero into trace_processor which
    we definitely want to avoid given that we want trace processor to
    compile in Google3.
    
    Change-Id: Ibb80c03e2732618e0085e05d63805b2284e94974

* Update platform/superproject from branch 'master'
  to df9eddd8af28b07576a2c664bb63e92c8e11f90c
  - Update git submodules
    
    * Update external/perfetto from branch 'master'
      to b4c6054d3d64b7a0eda8c62e3ffff1a44dd48083
      - Merge "perfetto: switch sys stats counter to use proto lite not pzero"
      - perfetto: switch sys stats counter to use proto lite not pzero
        
        Using the pbzero variant pulls in protozero into trace_processor which
        we definitely want to avoid given that we want trace processor to
        compile in Google3.
        
        Change-Id: Ibb80c03e2732618e0085e05d63805b2284e94974
2 files changed