clk: tegra: move audio clk to common file

Move audio clocks and PLLA initialization to a common file so it can be used by
multiple Tegra SoCs. Also a new array tegra114_clks is introduced for Tegra114
which specifies which common clocks are available on Tegra114 and what their
DT IDs are.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>