NFC Adapter Extras API update.

Remove
o registerTearDownApdus()
o deregisterTearDownApdus()
They were already NO-OPS, and don't work in the general case.

Add
o authenticate(byte[] token)
This future proofs us for a more flexible access control scheme.

Change-Id: I4cb67ceeb63d61cbc333c9b244a96d8687402168