Split blacklist from versioned blacklists.

Previously we use blacklist to get all blacklists, to maintain the consistency
between blacklist and whitelist, and to move blacklist processing to GPU
service, we added blacklists to store all blacklists, and now blacklist will
only represent one blacklist.

BUG: 120869311
Test: Build, flash and boot. Verified in master patch ag/6288554
Change-Id: Ifac875177ad959705c8f80672341c4cbee7bbc93
Exempt-From-Owner-Approval: Change in CoreSettingsObserver.java is too minor