PAC/BTI must be enabled to boot Arm Trusted Firmware.

An additional line needs to be removed from the l4t_bup_gen.func and
tegrahost_v2 is no longer present (or needed) for flashing.

Some directories are present, but empty. Only do the mv if there
are files present.

It is not present in r36, so only patch it if it's present.

In jetpack 6, libnvidia-ptxjitcompiler.so is suffixed with the CUDA
driver version, not the l4t version. Describe the CUDA driver version in
the overlay.nix and use it, if set.

In L4T r36, the "t186ref" directory is renamed to "generic". Handle it
with a variable.

USB OTG should work in Jetpack 6.

In jetpack 6, there are multiple csv files to describe the necessary
container context. The nvidia-ctk tool is not satisfied if the csv files
are simply concatenated. Install all the files and register both with
nvidia-ctk cdi generate.

In jetpack 6, flash.sh must be called with --sign argument. See
build_l4t_bup.sh.

A couple of patches to fixup the makefile and suppress a
-Wunused-result. cupti-samples also exports a shared object now, so
install that in $out/lib.

Jetpack 6 ships CUDA 12 and uses cudnn v9.

Minor patch no longer-applicable and hunk adjustments for jetpack 6.

Add additional build input dependencies needed only on jetpack 6 (cuda
12+).

Align cuda_nvcc fixups with
https://github.com/ConnorBaker/cuda-packages/blob/7731ebdf397c5ce123571abf2dc41ebac86237d3/pkgs/development/cuda-modules/fixups/cuda/cuda_nvcc.nix

CUDA no longer ships the cuda-samples source. Fetch and build it from
GitHub.

More drivers are modules now and erasesize sysfs is broken. Hard-code it
to 16384.

Link: OE4T/meta-tegra@106d558

This appears to be working, but the conftest doesn't work well with any
of the kernels I threw at it.

When booting off rootfs over USB, the USB drivers need to be probed.
Add the needed modules to get those drivers probed.

Describe support matrix for JetPack 6 and "gotchas" with keeping
firmware and kernel/rootfs aligned.