arm: imx6q: Add Engicam i.CoreM6 Quad/Dual RQS Starter Kit initial support

Boot from MMC:
-------------
U-Boot SPL 2016.11-rc2-g217bd8e-dirty (Nov 08 2016 - 22:59:44)
Trying to boot from MMC1

U-Boot 2016.11-rc2-g217bd8e-dirty (Nov 08 2016 - 22:59:44 +0530)

CPU:   Freescale i.MX6D rev1.2 at 792 MHz
Reset cause: POR
Model: Engicam i.CoreM6 Quad/Dual RQS Starter Kit
DRAM:  512 MiB
MMC:   FSL_SDHC: 0
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   CPU Net Initialization Failed
No ethernet found.
Hit any key to stop autoboot:  0
icorem6qdl-rqs>

Cc: Stefano Babic <sbabic@denx.de>
Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>