ARM: zynq: dt: Updated devicetree for Zynq 7000 platform.

Added addtional nodes required for FPGA Manager operation
of the Xilinx Zynq Devc configuration interface.

Reviewed-by: Sören Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>