ASoC: nau8822: Disable internal PLL if freq_out is zero

After finishing the playback or recording, the machine driver might
call snd_soc_dai_set_pll(codec, pll_id, 0, 0, 0) to stop the internal
PLL, but with the codec driver nau8822, it will print error as below:
 nau8822 0-001a: Unsupported input clock 0
 fsl-asoc-card sound-nau8822: failed to stop FLL: -22

Refer to the function wm8962_set_fll() in the codec driver wm8962, if
the freq_out is zero, turn off the internal PLL and return 0.

Cc: David Lin <[email protected]>
Cc: John Hsu <[email protected]>
Cc: Seven Li <[email protected]>
Signed-off-by: Hui Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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