dt-bindings: ata: ahci-ceva: convert to yaml

Convert the ahci-ceva doc to yaml.

Signed-off-by: Piyush Mehta <piyush.mehta@xilinx.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220620073717.3079-1-piyush.mehta@xilinx.com