udev: Update udev package from udev-106 to udev-142

Update the init scripts have to use udevadm where appropriate.
The udev package no longer provides separate udev utilities
like udevtrigger and udevsettle.  These have been incorporated
into the udev admin program udevadm.

Replace the udevextras sub package with config options to the udev
package.

Update the preinit script to check for '/lib/udev/devices', and
copy it to '/dev/ if it is found, then to conditionaly setup
/dev the old way with mknod etc.  Udev now recommends using
the directory '/lib/udev/devices' to initialize the '/dev'
directory at startup.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17378 3c298f89-4303-0410-b956-a3cf2f4a3e73