drm/tegra: hdmi: Parameterize based on compatible property

Use a structure to parameterize the code to handle differences between
the HDMI hardware on various SoC generations. This removes the need to
clutter the code with checks for individual compatible values.

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

diff --cc drivers/gpu/drm/tegra/hdmi.c
Simple merge

diff --cc drivers/gpu/drm/tegra/hdmi.h
Simple merge