armv8/ls2085ardb: Enable NAND SPL support

Enable NAND boot support using SPL framework. To boot from
NAND, either use DIP switches on board, or "qixis_reset nand"
command. Details of forming NAND image can be found in README.

Signed-off-by: Scott Wood <scottwood@freescale.com>
[York Sun: Remove +S from defconfig after commit 252ed872]
Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/configs/ls2085ardb_nand_defconfig b/configs/ls2085ardb_nand_defconfig
new file mode 100644
index 0000000..74812f7
--- /dev/null
+++ b/configs/ls2085ardb_nand_defconfig
@@ -0,0 +1,4 @@
+CONFIG_SYS_EXTRA_OPTIONS="SYS_FSL_DDR4,NAND"
+CONFIG_SPL=y
+CONFIG_ARM=y
+CONFIG_TARGET_LS2085ARDB=y