Add a note regarding the 4.1 change to add openssh-sftp-server as a
recommends from ssh-server-dropbear.
(From yocto-docs rev: dd4775d666ca8309ef029fd329a248397bcdedc6)
Signed-off-by: Paul Eggleton <paul.eggleton@microsoft.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>