This is an import of the fw-2 tag of tkey-libs.
We import the entire tkey-libs repo minus dot files into the
tillitis-key1 repo to make it very simple not to make mistakes
regarding which firmware tag depends on which tkey-libs tag,
especially considering locking down with NVCM.
Please see README for information about developing with another
tkey-libs or how to import future tkey-libs.
Since tkey-libs is now a part of the repo we also add tkey-libs to the
clean_fw target.
