ARM: dts: TS-4900: add basic device tree

These device trees add support for TS-4900 by Technologic Systems.

More details here:
   http://wiki.embeddedarm.com/wiki/TS-4900



Signed-off-by: Lucile Quirion <lucile.quirion@savoirfairelinux.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>