Sign micrdroid using testkey from external/avb

This will allow to share the same u-boot.bin which embedds the public
key from the testkey across cuttlefish and microdroid.

Bug: 181923066
Test: atest MicrodroidHostTestCases
Change-Id: Ia8ca47d81ba69992facfc8dadc98299612cadd66
2 files changed
tree: 600ddee36cf240b09e02901f2c426b9a9f4e2945
  1. apex/
  2. authfs/
  3. docs/
  4. microdroid/
  5. tests/
  6. virtmanager/
  7. vm/
  8. .clang-format
  9. PREUPLOAD.cfg