ARM: tegra: tamonten: Add host1x support

Hook up the required regulators, I2C DDC adapter and hotplug detect GPIO
to the Tamonten HDMI output. Carrier boards still need to explicitly
enable the output to use it.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Stephen Warren <swarren@nvidia.com>