FsCrypt: silently skip "." and ".." when loading keys

Avoid logging useless messages like:

    D vold    : Skipping non-key .
    D vold    : Skipping non-key ..
    D vold    : Skipping non-de-key .
    D vold    : Skipping non-de-key ..

Change-Id: I8d2bd67d554605a5ab9faadd3730870dfe0881f6
1 file changed