dt-bindings: fpga: convert Xilinx Zynq MPSoC bindings to YAML

Convert FPGA Manager for Xilinx Zynq MPSoC bindings documentation to
YAML.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Link: https://lore.kernel.org/r/20210716212621.286806-1-iwamatsu@nigauri.org


Signed-off-by: Rob Herring <robh@kernel.org>