Make locksettings commands go through "cmd lock_settings"

This greatly improves the performance of locksettings commands, and it
eliminates the need for LockSettingsCmd.java.

Bug: 177985929
Test: locksettings command still works
Change-Id: I5881fa074681f6bf1ad2f5969a282d928121ddb2
Merged-In: I5881fa074681f6bf1ad2f5969a282d928121ddb2
(cherry picked from commit 4d38b0cdc42a6b289e321facbf992feb898258b7)
3 files changed