udev

I've got udev working on our platform. It's initially ported by an intern, but it seemed not working before he left. The problem was due to the kernel configuration. Once I sorted out the proper kernel configuration, udevd started properly and it works. The ota also worked with the udev. The previous port of udev was udev 142 version, which is rather old. I am porting the 150 version to our system.