linux-wandboard (3.0.35): add recipe for 'official' wandboard kernel

Adds a recipe to build a kernel using the 'offical' wandboard
git repository.  Recipe is two parts.  linux-wandboard.inc specifies
items that should not change very often (SRCURI, LICENCE, and some
task append functions).  The .bb file specifies the SRCREV and
other things that could change quite often.