clk: tegra: Make sor_safe the parent of dpaux and dpaux1

It turns out that sor_safe, rather than pll_p, is the parent of the
dpaux and dpaux1 clocks.

Acked-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>