Device tree binding for NVIDIA Tegra have traditionally carried the
"nvidia," vendor prefix in the filename. A couple of odd ones don't, so
fix them up for consistency.

Also rename existing bindings to reflect the first compatible value that
they document. This wasn't done consistently either.
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NRob Herring <robh@kernel.org>