Read adb public key from bootconfig on boot.

- create qemu-adb-keys vendor exec to write key to
/data/vendor/adb/adb_keys
- init copies over from /data/vendor/adb/adb_keys to /data/misc/adb/adb_keys

Bug: 183668221
Test: Boot emulator user build, adb is authorized.
Change-Id: Icba8b6416febc423e525d8bb606f6ff68393ef01
Merged-In: Icba8b6416febc423e525d8bb606f6ff68393ef01
12 files changed