dt-bindings: ata: ahci: ceva: Update documentation for CEVA Controller

This patch updates the documentation for the CEVA controller for adding
the optional properties for 'phys' and 'resets'.

Signed-off-by: Piyush Mehta <piyush.mehta@xilinx.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>