ARM: tegra: tamonten: Add PCIe support

Add properties common to all Tamonten-derived boards to the Tamonten
DTSI and add the fixed 1.05 V regulator.

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