Update git submodules

* Update system/core from branch 'main'
  to 901b3ec78e1feb750657a41779c28c7983b3a6fa
  - Merge changes If17796f4,If44918c5,I559fb264 into main
    
    * changes:
      mkbootfs: Allow invocation with no directories specified
      mkbootfs: Fix usage message for dev node list files
      mkbootfs: Fix -f typo in usage message
    
  - mkbootfs: Allow invocation with no directories specified
    
    1. A non-empty archive can still be generated, if a dev nodes
    file is specified; and
    2. cpio itself handles the case of an empty archive
    (containing only the trailer entry), for example:
      echo -n | cpio -oc | cpio -it
    
    Bug: 328362894
    Change-Id: If17796f445e50842249554a1e82478bc375cf5eb
    
  - mkbootfs: Fix usage message for dev node list files
    
    Bug: 328362894
    Change-Id: If44918c52ff5bb0ca207fa4817ac14ae5af8c55f
    
  - mkbootfs: Fix -f typo in usage message
    
    Bug: 328362894
    Change-Id: I559fb2640cb9fda7dbba172709ad1c3a7f3b6dd9
    
1 file changed