arm64: a8k: dts: Add support for NAND devices on A8K platform

Add NAND to CP master device tree. Add armada-7040-db-nand
device tree for the board configured with NAND boot device.
Add comment about boot device ID to armada-7040-db DTS.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Igal Liberman <igall@marvell.com>
Cc: Nadav Haklai <nadavh@marvell.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 4d656ce..4528a8f 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -81,6 +81,7 @@
 	armada-388-gp.dtb			\
 	armada-385-amc.dtb			\
 	armada-7040-db.dtb			\
+	armada-7040-db-nand.dtb			\
 	armada-8040-db.dtb			\
 	armada-8040-mcbin.dtb			\
 	armada-xp-gp.dtb			\