ARM: dts: mvebu: armada-385-db-88f6820-amc: auto-detect nand ECC properites

This board has a Micron MT29F8G08ABACAWP chip which requires a ECC
strength of 8/512. Rather than hard coding any particular strength the
the nand controller auto-detect the ECC strength based on the ONFI data.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

arch/arm/boot/dts/armada-385-db-88f6820-amc.dts

@@ -99,8 +99,6 @@ nand@0 {
 		label = "pxa3xx_nand-0";
 		nand-rb = <0>;
 		nand-on-flash-bbt;
-		nand-ecc-strength = <4>;
-		nand-ecc-step-size = <512>;
 
 		partitions {
 			compatible = "fixed-partitions";