Delete X.org append recipes. It causes bootup error.
	deleted:    recipes-graphics/xorg-xserver/xserver-xf86-config/jetson-tk1/xorg.conf
	deleted:    recipes-graphics/xorg-xserver/xserver-xf86-config_0.1.bbappend
	deleted:    recipes-graphics/xorg-xserver/xserver-xorg_1.15.1.bbappend
Add glx extention.
	modified:   conf/machine/jetson-tk1.conf