Use Scrypt to hash long passwords in RecoverableKeyStore

It's enabled for test mode for now, and will need to be updated after
the other components of the system is updated.

Bug: 77325751
Test: runtest frameworks-services -p
    com.android.server.locksettings.recoverablekeystore

Change-Id: I4fc77aba37aeddbe6a82b633934b068cd4ac507f