Xorg.conf don't need L4T configs. It's provided by linux-driver-package recipe.
	modified:   recipes-graphics/xorg-xserver/xserver-xf86-config_0.1.bbappend
Modified to change the settings to match the configuration in X.org.
	modified:   recipes-graphics/xorg-xserver/xserver-xorg_1.15.1.bbappend
Add boot config recipe.
	new file:   recipes-bsp/bootconfig/bootconfig/jetson-tk1_extlinux.conf.emmc
	new file:   recipes-bsp/bootconfig/bootconfig/jetson-tk1_extlinux.conf.nfs
	new file:   recipes-bsp/bootconfig/bootconfig/jetson-tk1_extlinux.conf.sdcard
	new file:   recipes-bsp/bootconfig/bootconfig/jetson-tk1_extlinux.conf.usb
	new file:   recipes-bsp/bootconfig/bootconfig_21.1.0.bb
Add kernel image and boot config to images.
	modified:   conf/machine/jetson-tk1-l4t.conf