Add etc -> system/etc symlink for cgroups

Bug: 185186899
Test: run microdroid and see log
Change-Id: I1ac7639f32f3dcc4d703ee752d015946ead00e8f
1 file changed
tree: f0fb94ae85ce301c2a72cfb30c6155956fe681ea
  1. apex/
  2. authfs/
  3. docs/
  4. microdroid/
  5. tests/
  6. virtmanager/
  7. vm/
  8. .clang-format
  9. PREUPLOAD.cfg