Since udev-176, udev no longer creates device nodes under /dev
and this has to be managed by the kernel devtmpfs filesystem.
This means that a kernel built with the current defconfigs
will not boot on a system with a recent udev.
Also, enable automatic mounting of /dev for filesystems which
don't manually mount it.
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
3023ebf427