ARM: dts: imx6ul-geam: Add Engicam IMX6UL GEA M6UL initial support

IMX6UL GEA M6UL modules are system on module solutions manufactured
by Engicam with following characteristics:
Processor	Freescale i.MX 6UltraLite MCIMX6G2, 528 MHz
RAM		128MB, 16-bit DDR3
NAND SLC	256MB
Power supply	Single 5V
MAX LCD RES	up to WXGA, 1366x768

and more info at
http://www.engicam.com/prodotti/embedded/som/sodimm/gea-m6ul



Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Matteo Lisi <matteo.lisi@engicam.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>