systemd: bump to version 216

Bump systemd to version 216. This new version provides two new tools to
manage the journal (systemd-journal-upload and systemd-journal-remote)
which resulted in the addition of new users.

Also remove backported patches.

Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>