For a full systemd distro, also add a weak assignment for systemd as
the dev manager.
(From OE-Core rev: 55c1c749b9d4ffdf00978391fd0437348ba75caa)
Signed-off-by: Vivien Didelot <vdidelot@pbsc.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>