The Xilinx VPSS Scaler is a Video IP that supports up scaling, down scaling and
no scaling functionailty along with color space conversion. This supports custom
resolution values between 0 to 4096.

Required properties:

- compatible: Must be "xlnx,ctrl-xvpss-1.0".
- reg: Base address and size of the IP core.
- reset-gpios: gpio to reset the framebuffer IP
- xlnx,vpss-taps: number of taps
- xlnx,vpss-ppc: pixels per clock

Example:

        ctrlvpss: vpss@0xa0200000 {
                compatible = "xlnx,ctrl-xvpss-1.0";
                reg = <0x0 0xa0200000 0x0 0x30000>;
                reset-gpios = <&gpio 80 1>;
                xlnx,vpss-taps = <6>;
                xlnx,vpss-ppc = <2>;
        };
