Remove HardwareAuthToken parameter from addUserKeyAuth

Due to the migration to synthetic passwords, the 'token' parameter to
addUserKeyAuth() is no longer needed.  Remove it.

Test: atest com.android.server.locksettings
Bug: 184723544
Change-Id: I06e7c36787cc7f384acb7742737c3b1cfa50f0ae
(cherry picked from commit 6b220a95)
Merged-In: I06e7c36787cc7f384acb7742737c3b1cfa50f0ae