ARM: dts: zynq: Add xlnx prefix to GEM compatible string

cdns,zynq/zynqmp/versal-gem was recently deprecated in Linux in
favour of xlnx prefix. Add this new compatible string and remove
the existing cdns,zynq-gem compatible string.

Signed-off-by: Harini Katakam <[e-mail]>
Signed-off-by: Michal Simek <[e-mail]>
Link: https://lore.kernel.org/r/7768[e-mail]

arch/arm/boot/dts/zynq-7000.dtsi

···
 		};
 
 		gem0: ethernet@e000b000 {
-			compatible = "cdns,zynq-gem", "cdns,gem";
+			compatible = "xlnx,zynq-gem", "cdns,gem";
 			reg = <0xe000b000 0x1000>;
 			status = "disabled";
 			interrupts = <0 22 4>;
···
 		};
 
 		gem1: ethernet@e000c000 {
-			compatible = "cdns,zynq-gem", "cdns,gem";
+			compatible = "xlnx,zynq-gem", "cdns,gem";
 			reg = <0xe000c000 0x1000>;
 			status = "disabled";
 			interrupts = <0 45 4>;