eudev: create static-nodes in init script

dev in modules.devname should be populated in /dev on boot.  remove
create static mode from udevd will make these devices cannot be
populated. Since commit [1], when use sysVinit, devices like
/dev/net/tun will not be created.

more info:
udevd in systemd also remove create static mode in udevd, but using
service kmod-static-nodes.service and systemd-tmpfiles-setup-dev.service
in systemd to create these node, so systemd works well.

For sysV, parse kmod static-nodes and generate the device nodes in init

[1] https://gitweb.gentoo.org/proj/eudev.git/commit/?id=2b7abd5ec9cc47a8b895df6db77fb1537c6f1a39



Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>