dt-bindings: reset: convert the xlnx,zynqmp-reset.txt to yaml

Convert the binding to DT schema format. It also updates the
reset-controller description.

Signed-off-by: Piyush Mehta <piyush.mehta@amd.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Message-ID: <20230613123048.2935502-1-piyush.mehta@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>