drm/tegra: Changes for v5.10-rc1

This is a handful of patches that add bridge support for Tegra devices
and fix a couple of minor issues.
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Thierry Reding <thierry.reding@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200921121245.3953659-1-thierry.reding@gmail.com