[yocto] beagleboard: change to xserver-xorg, not -lite

[Ross Burton]

Coming up is a patch to change the meta-yocto-bsp beagleboard machine to use
xorg-xserver instead of xorg-xserver-lite.  The -lite variant was intended to be
GLX/DRI-free for systems which don't support GLX but the GLX module is packaged
separately so it's simple enough to just not install it.

Yi Zhao at Wind River has done a test run with this patch and found no
regressions.