Add systemd recipes and associated support recipes.
Mostly based on meta-oe/meta-systemd, so almost all credit should go to:
Andreas Müller <schnitzeltony@googlemail.com>
Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Holger Hans Peter Freyther <holger@moiji-mobile.com>
Khem Raj <raj.khem@gmail.com>
Koen Kooi <koen@dominion.thruhere.net>
Martin Jansa <Martin.Jansa@gmail.com>
(From OE-Core rev: 6a8a48b4d0d0b9b8d8af46cae11245bcb870bbc3)
Signed-off-by: Radu Moisan <radu.moisan@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
b8744d5376