arm/dt: tegra: add dts file for paz00

This adds a dts file for paz00. As a side effect, this also enables
the embedded controller which controls the keyboard, touchpad, power,
leds, and some other functions.

Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>