ARM: at91: sama5d4: dts: change the nand compatible string

As we introduce a new "atmel,sama5d4-nand" compatible string for sama5d4,
so we need to apply it for sama5d4 chip.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/boot/dts/sama5d4.dtsi b/arch/arm/boot/dts/sama5d4.dtsi
index e7a1d76..5d6d0b3 100644
--- a/arch/arm/boot/dts/sama5d4.dtsi
+++ b/arch/arm/boot/dts/sama5d4.dtsi
@@ -273,7 +273,7 @@
 		};
 
 		nand0: nand@80000000 {
-			compatible = "atmel,at91rm9200-nand";
+			compatible = "atmel,sama5d4-nand", "atmel,at91rm9200-nand";
 			#address-cells = <1>;
 			#size-cells = <1>;
 			ranges;