dt-bindings: clock: tegra: Rename SOR0_LVDS to SOR0_OUT

Tegra186 and later call this clock SOR0_OUT. Rename it on Tegra124 and
Tegra210 to make the names consistent.

Keep the old name for now to keep device trees buildable until they have
all been converted.

Signed-off-by: Thierry Reding <treding@nvidia.com>