drm/tegra: Changes for v5.9-rc1

This set of patches contains a few preparatory patches to enable video
capture support from external camera modules. This is a dependency for
the V4L2 driver patches that will likely be merged in v5.9 or v5.10.

On top of that there are a couple of fixes across the board as well as
some improvements.

From a feature point of view this also adds support for horizontal
reflection and 180° rotation of planes.
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