arm64: zynqmp: Use zynqmp specific compatible string for macb

The patch
"devicetree: Add compatible string for Zynq Ultrascale+ MPSoC"
(commit <988d6f07>)
introduced specific compatible string for ZynqMP which should be used
first.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm64/boot/dts/xilinx/zynqmp.dtsi

@@ -355,7 +355,7 @@ lpd_dma_chan8: dma@ffaf0000 {
 		};
 
 		gem0: ethernet@ff0b0000 {
-			compatible = "cdns,gem";
+			compatible = "cdns,zynqmp-gem", "cdns,gem";
 			status = "disabled";
 			interrupt-parent = <&gic>;
 			interrupts = <0 57 4>, <0 57 4>;
@@ -366,7 +366,7 @@ gem0: ethernet@ff0b0000 {
 		};
 
 		gem1: ethernet@ff0c0000 {
-			compatible = "cdns,gem";
+			compatible = "cdns,zynqmp-gem", "cdns,gem";
 			status = "disabled";
 			interrupt-parent = <&gic>;
 			interrupts = <0 59 4>, <0 59 4>;
@@ -377,7 +377,7 @@ gem1: ethernet@ff0c0000 {
 		};
 
 		gem2: ethernet@ff0d0000 {
-			compatible = "cdns,gem";
+			compatible = "cdns,zynqmp-gem", "cdns,gem";
 			status = "disabled";
 			interrupt-parent = <&gic>;
 			interrupts = <0 61 4>, <0 61 4>;
@@ -388,7 +388,7 @@ gem2: ethernet@ff0d0000 {
 		};
 
 		gem3: ethernet@ff0e0000 {
-			compatible = "cdns,gem";
+			compatible = "cdns,zynqmp-gem", "cdns,gem";
 			status = "disabled";
 			interrupt-parent = <&gic>;
 			interrupts = <0 63 4>, <0 63 4>;