[m5234bcc] Enable mdev in the custom busybox configuration.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Update the Linux version to 3.7.1.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
[nslu] Add a new board type.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
[beaglebone] Add a new board type.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>