arm: imx6ul: Add Engicam GEAM6UL Starter Kit initial support

Boot Log:
--------
U-Boot SPL 2016.11-rc2-00144-g922adaa-dirty (Oct 28 2016 - 18:55:30)
Trying to boot from MMC1

U-Boot 2016.11-rc2-00144-g922adaa-dirty (Oct 28 2016 - 18:55:30 +0530)

CPU:   Freescale i.MX6UL rev1.1 528 MHz (running at 396 MHz)
CPU:   Industrial temperature grade (-40C to 105C) at 43C
Reset cause: POR
Model: Engicam GEAM6UL
DRAM:  128 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
geam6ul>

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>