armv8: LS2080A: Add device tree support for nand boot

Add device tree support for LS2080ARDB nand boot.

Signed-off-by: Sriram Dash <sriram.dash@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

configs/ls2080ardb_nand_defconfig

 CONFIG_ARM=y
 CONFIG_TARGET_LS2080ARDB=y
+CONFIG_DEFAULT_DEVICE_TREE="fsl-ls2080a-rdb"
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_SPL_I2C_SUPPORT=y
@@ -27,6 +28,7 @@ CONFIG_CMD_PING=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
+CONFIG_OF_CONTROL=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y