This patch adds a soc dtsi for the Wondermedia WM8850.

A board dts file is also included for the W70v2 tablet, with support
for all the drivers currently in mainline.
Signed-off-by: NTony Prisk <linux@prisktech.co.nz>
Signed-off-by: NOlof Johansson <olof@lixom.net>