ARM64: zynqmp: Add serdes address space dp driver

For run time serdes adjustment.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/dts/zynqmp.dtsi

@@ -846,7 +846,8 @@
 		xlnx_dp: dp@fd4a0000 {
 			compatible = "xlnx,v-dp";
 			status = "disabled";
-			reg = <0x0 0xfd4a0000 0x1000>;
+			reg = <0x0 0xfd4a0000 0x1000>,
+			      <0x0 0xfd400000 0x20000>;
 			interrupts = <0 119 4>;
 			interrupt-parent = <&gic>;
 			clock-names = "aclk", "aud_clk";