dt-bindings: arm: add Ebang EBAZ4205 board

Add the Ebang EBAZ4205 board to the Zynq-7000 board category.

Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20210120194033.26970-3-michael@walle.cc


Signed-off-by: Michal Simek <michal.simek@xilinx.com>