arm64: tegra: Fix duplicate regulator on Jetson TX1

When the top-level regulators were renamed, the 1.2V camera regulator
accidentally ended up with the same DT node name as the 1.8V camera
regulator.

Fixes: 097e01c6

 ("arm64: tegra: Rename top-level regulators")
Signed-off-by: Thierry Reding <treding@nvidia.com>