Rename WANDBOARD-COMMON to WANDBOARD.common and adjust the configs that
include it accordingly.  The build machinery for universe and tinderbox
tries to build every kernel config whose name begins and ends with [A-Z0-9]
and the common include file that has most of the options isn't buildable
by itself, so the new lowercase .common will avoid building it.
Properly quote the included filename, now that it has a dot in it.  Doh.