drm/tegra: dpaux: Parameterize CMH, DRVZ and DRVI

The CMH, DRVZ and DRVI values vary depending on the SoC generation. Move
them into SoC specific structures so that DT compatible string matching
can be used to select the right parameters and write them to hardware at
the right time.

Signed-off-by: Thierry Reding <treding@nvidia.com>