Import libfido2 at 'contrib/libfido2/'
git-subtree-dir: contrib/libfido2
git-subtree-mainline: d586c978b9b4216869e589daa5bbcc33225a0e35
git-subtree-split: a58dee945a5da64d0e97f35a508928e0d17c9cc7
(cherry picked from commit 0afa8e065e14bb8fd338d75690e0238c00167d40)