xen: add support for files added with Xen 4.6
xen: add support for files added with Xen 4.6

Xen 4.6 dropped udev support and has instead switched to their own
'devd' daemon run by the xl command. There is a SysV init script
provided with it but no systemd service file.

Signed-off-by: Doug Goldstein <8172f793ca553050868d487fd13b508d19cae503@cardoe.com>
Signed-off-by: Chris Patterson <7d24780dd239803f5baf17ec7453905ac61c7dd3@gmail.com>
Signed-off-by: Bruce Ashfield <9ae9c44b775ee9b29f4f502415e02e61a9b1a6a0@zedd.org>

lgirdk/meta-virtualization,cjp256/meta-virtualization,cardoe/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,cjp256/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,cjp256/meta-virtualization,cardoe/meta-virtualization