liteboard is a development board which uses liteSOM as its
base. liteSOM can't exist on its own, but is used as part
of other boards - it only contains processor and memory.

Hardware specification:
 * liteSOM:
   - i.MX6UL
   - 256M or 512M DDR3 RAM
   - eMMC (uSDHC2)
 * Ethernet PHY
 * USB host (usb_otg1)
 * MicroSD slot (uSDHC1)

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>