Add device tree data for DA850 EVM. At this time, only
information on serial ports is added.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>

Add support for booting DA850 using flattened device
tree to describe the hardware. At this time only the
very basic bootup using a serial console is supported.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>