arm: imx6q: Add devicetree support for Engicam i.CoreM6 DualLite/Solo

i.CoreM6 DualLite/Solo modules are system on module solutions
manufactured by Engicam with following characteristics:
CPU           NXP i.MX6 DL, 800MHz
RAM           1GB, 32, 64 bit, DDR3-800/1066
NAND          SLC,512MB
Power supply  Single 5V
MAX LCD RES   FULLHD

and more info at
http://www.engicam.com/en/products/embedded/som/sodimm/i-core-m6s-dl-d-q

Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/configs/imx6qdl_icore_mmc_defconfig b/configs/imx6qdl_icore_mmc_defconfig
index c2c2fe8..6786daf 100644
--- a/configs/imx6qdl_icore_mmc_defconfig
+++ b/configs/imx6qdl_icore_mmc_defconfig
@@ -3,6 +3,7 @@
 CONFIG_TARGET_MX6Q_ICORE=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/imx-common/spl_sd.cfg,ENV_IS_IN_MMC"
 CONFIG_DEFAULT_FDT_FILE="imx6dl-icore.dtb"
+CONFIG_DEFAULT_DEVICE_TREE="imx6dl-icore"
 CONFIG_SYS_PROMPT="icorem6qdl> "
 CONFIG_SPL=y
 CONFIG_BOOTDELAY=3