u-boot : Update to recent rev from Xilinx git repo.

Signed-off-by: Philip Balister <philip@balister.org>
linux-zynq : Update to recent rev from Xilinx git repo.

Starting to add multiple machine support via dtsi files. If you want
to modify the kernel config and device tree, please use bbappends in
another layer, rather than copying/branching this layer.

Signed-off-by: Philip Balister <philip@balister.org>
zc702-proto-image : Update recipe structure to be more correct :)

Signed-off-by: Philip Balister <philip@balister.org>