feroceon-kw2: added gflt200 board file.

The intention is for this to be a place for gflt200 board code that doesn't have
an obvious home in the Marvell BSP (e.g. hardware version, user space GPIOs, GbE
LEDs configuration, ...).

Change-Id: I4397c2da4e75cefb5304e280b96e86a02a4be29e
3 files changed