Enable adbd on microdroid

The following system properties are forcibly set to make adbd function.

ro.apex.updatable=true : otherwise, apexd doesn't activate critical
APEXes like the runtime APEX

ro.adb.secure=0 : to bypass the adb authentication

ro.debuggable=1 : to be able to use ro.adb.secure=0

This change also updates README.md file for the instruction to use adb.

Bug: 181728474
Test: adb shell works towards microdroid. See microdroid/README.md

Change-Id: Ica405e8bd4d2d1ef03e545aef5ed07ddc4bea34c
3 files changed
tree: e03d2514ca1f5b26227964f3c3970645f05692be
  1. apex/
  2. authfs/
  3. docs/
  4. microdroid/
  5. tests/
  6. virtmanager/
  7. .clang-format
  8. PREUPLOAD.cfg