Add care_map to target_files package

Generate a new file containing care_data of system (and vendor)
partition, and add it under META/ of target file package. For
A/B update, copy this file to OTA package for later use by
update_verifier.

Bug: 27175949

Change-Id: I90bb972703afaeb94bc3efe718fd81b1cfbcabcc
3 files changed