eudev: new package

eudev is a userspace device management daemon. It is a standalone
version, independent from systemd. It is a fork maintained by Gentoo.

Features:

 - No extra configuration options are available: Gudev is build if
   libglib2 is selected.
 - No dependency on hwdata as the package uses its own hardware
   database (as does systemd).

eudev 1.3 is in sync with systemd v207.

[Peter: add BR2_USE_MMU dependency]
Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>