ASoC: nau8825: Change Tegra clk_out_2 provider to PMC
Tegra clk_out_1, clk_out_2, and clk_out_3 are part of PMC block and
these clocks are moved from the clock driver to PMC driver with PMC as
a provider for these clocks.
Update bindings document to use PMC as clock provider for clk_out_2 and
change ID to PMC clock ID.