rcn: prep for the big /boot/uboot/ -> /boot/ switch

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
rcn: we are in a bootz/zImage world now

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
rcn: move to /boot by default

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>