microdroid: remove redundant mk_microdroid_signature

And update signature/README.md

Bug: n/a
Test: MicrodroidHostTestCases
Change-Id: I0ce59e0cabacc9a1542fc60b56d83a1c233d8ff6
4 files changed
tree: fd05fe4fad7a2f17f107e78a6fec18aefb95d63f
  1. apex/
  2. authfs/
  3. compos/
  4. docs/
  5. microdroid/
  6. tests/
  7. virtmanager/
  8. vm/
  9. zipfuse/
  10. .clang-format
  11. PREUPLOAD.cfg