Don't use qcow2 for userdata.

We provide a sparse file directly as a (writable) partition image and
format a filesystem on the partition inside the VM.

To format it only when it's not formatted, the option `formattable` is
added to the fstab entry for the userdata partition.

Bug: 185767624
Test: atest MicrodroidHostTestCases
Change-Id: Ia938fd60071e64170b8280d19c17c4413c769337
4 files changed
tree: 217a87258e9dd3a63d584ba45a83f5cf7d558885
  1. apex/
  2. authfs/
  3. compos/
  4. docs/
  5. launcher/
  6. microdroid/
  7. tests/
  8. virtmanager/
  9. vm/
  10. zipfuse/
  11. .clang-format
  12. PREUPLOAD.cfg