Update git submodules

* Update external/autotest from branch 'master'
  to 4bb638b83c2454320460403e4bc14cc16631d649
  - arc: Remove cheets_ContainerMount from bvt whitelist am: 75e40778c4
    
    Change-Id: Ic54eee423910d36045d5bfa0ecaff9ec361a6a7e
    
  - arc: Remove cheets_ContainerMount from bvt whitelist
    
    As described.
    
    BUG=b:149790801
    TEST=None
    
    Change-Id: I1c1a4372eabec888d98a48e3b3ebbe20ce349214
    Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2065533
    Tested-by: Yury Khmel <khmel@chromium.org>
    Auto-Submit: Yury Khmel <khmel@chromium.org>
    Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
    Reviewed-by: Gregory Nisbet <gregorynisbet@google.com>
    Reviewed-by: Gregory Nisbet <gregorynisbet@chromium.org>
    Commit-Queue: Gregory Nisbet <gregorynisbet@google.com>
    
1 file changed