Initial support for NVIDIA Tegra

live-build/auto/config:
- for Ubuntu Server live images and the arm64+tegra full arch, build a
  tegra variant with linux-nvidia-tegra as the flavor and
  linux-nvidia-tegra as the kernel meta-package
- default to nvidia-$SUBARCH as the kernel flavor for all images using
  arm64+tegra as full arch

hooks/03-kernel-metapkg.chroot_early:
- use linux-nvidia-tegra as kernel meta-package for the nvidia-tegra
  flavor

live-build/auto/config

@@ -969,6 +969,9 @@ case $PROJECT in
 					intel-iot)
 						variants='intel'
 						;;
+					tegra)
+						variants='tegra'
+						;;
 					*)
 						# variants='ga hwe'
 						variants='ga'
@@ -985,6 +988,9 @@ case $PROJECT in
 					elif [ "$variant" = "intel" ]; then
 						kernel_metapkg=linux-intel-iotg
 						flavor=intel-iotg
+					elif [ "$variant" = "tegra" ]; then
+						kernel_metapkg=linux-nvidia-tegra
+						flavor=nvidia-tegra
 					else
 						echo "bogus variant: $variant"
 						exit 1
@@ -1237,6 +1243,11 @@ case "$ARCH${SUBARCH:++$SUBARCH}" in
 		add_package install linux-firmware-raspi pi-bluetooth u-boot-rpi u-boot-tools
 		BINARY_REMOVE_LINUX=false
 		;;
+	arm64+tegra)
+		# Common configuration for all NVIDIA Tegra image variants (server,
+		# desktop etc.)
+		KERNEL_FLAVOURS="nvidia-$SUBARCH"
+		;;
 	riscv*+*)
 		if [ "${SUBARCH:-}" = "licheerv" ]; then
 			# The wifi driver of the licheerv is an out-of-tree driver packaged

live-build/ubuntu-server/hooks/03-kernel-metapkg.chroot_early

@@ -13,6 +13,8 @@ case $PASS in
             kernel_metapkg=linux-generic-hwe-$(lsb_release -sr)
         elif [ "$flavor" = "intel-iotg" ]; then
             kernel_metapkg=linux-intel-iotg
+        elif [ "$flavor" = "nvidia-tegra" ]; then
+            kernel_metapkg=linux-nvidia-tegra
         else
             echo "bogus flavor: $flavor"
             exit 1