Set base_dir of microdroid to system

Bug: 179652970
Test: see contents of microdroid.img
Change-Id: I67abae5e308ea1f0d67b426fc2bcaa36773634cc
1 file changed
tree: db702144346eee0ef8335c972295e90567015792
  1. apex/
  2. authfs/
  3. docs/
  4. microdroid/
  5. tests/
  6. virtmanager/
  7. .clang-format
  8. PREUPLOAD.cfg