arm: mvebu: Fix compatible string for nand controller

Linux kernel uses compatible string "marvell,armada370-nand-controller" for
nand controllers on Armada 370/XP/38x. U-Boot currently uses mix of
"marvell,armada370-nand" and "marvell,mvebu-pxa3xx-nand".

So unify it and use just Linux kernel compatible string.

Signed-off-by: Pali Rohár <pali@kernel.org>
Acked-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/dts/armada-375.dtsi b/arch/arm/dts/armada-375.dtsi
index ff0ad7a..fcb9245 100644
--- a/arch/arm/dts/armada-375.dtsi
+++ b/arch/arm/dts/armada-375.dtsi
@@ -541,7 +541,7 @@
 			};
 
 			nand@d0000 {
-				compatible = "marvell,armada370-nand";
+				compatible = "marvell,armada370-nand-controller";
 				reg = <0xd0000 0x54>;
 				#address-cells = <1>;
 				#size-cells = <1>;