clk: rp1: Allow clk_i2s to change the audio PLLs
Add dedicated code allowing the audio PLLs to be changed, enabling
perfect I2S clock generation. The slowest legal pll_audio_core and
pll_audio will be selected that leads to the required clk_i2s rate.
Signed-off-by:
Phil Elwell <phil@raspberrypi.com>
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