armv8/ls1043ardb: Add nand boot support

Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com>
Signed-off-by: Hou Zhiqiang <B48286@freescale.com>
Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Mingkai Hu <Mingkai.Hu@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/ls1043ardb/README b/board/freescale/ls1043ardb/README
index d5925a9..4f15557 100644
--- a/board/freescale/ls1043ardb/README
+++ b/board/freescale/ls1043ardb/README
@@ -83,3 +83,4 @@
 Booting Options
 ---------------
 a) NOR boot
+b) NAND boot