authfs: Drop support of direct I/O

Previously, there was a plan to use dm-verity to verify disk image over
authfs. Supporting direct I/O for those files allows us to avoid an
extra buffer. The plan has changed, so let's get rid of the support.

Bug: 186265793
Test: run dex2oat, saw mmap(2) succeeds
Change-Id: Id556f5ae9b02f1c30f6e9b605d1d48a039989fba
1 file changed
tree: 7bd8f796602c88b25fa9b6f6870f04105636e840
  1. apex/
  2. authfs/
  3. docs/
  4. microdroid/
  5. tests/
  6. virtmanager/
  7. vm/
  8. .clang-format
  9. PREUPLOAD.cfg