Support for Intel NUC

 * Added meta-intel and meta-nuc layers,
 * Added nuc.conf with guacamayo specific tweaks,
 * Enabled ROOTLES_X in nuc.conf (missing from upstream setup),
 * Masked out meta-intel for other machines,
 * Masked out meta-intel mesa-dri bbappend (needs newer mesa and no required)
lirc-modules: add 3.4 kernel patch also for NUC

I would really want to add it generically for x86_64, but that does not seem
to work for the NUC.