It should be something like the following.
LABEL primary
MENU LABEL primary kernel
LINUX /boot/Image
FDT /boot/dtb/kernel_tegra234-p3768-0000+p3767-0005-nv.dtb
OVERLAYS /boot/tegra234-p3767-camera-test-overlay.dtbo
INITRD /boot/initrd
APPEND ${cbootargs} root=PARTUUID=xxx rw rootwait rootfstype=ext4 mminit_loglevel=4 console=ttyTCU0,115200 firmware_class.path=/etc/firmware fbcon=map:0 net.ifnames=0 nospectre_bhb video=efifb:off console=tty0 nv-auto-config