ASoC: nau8822: Don't reconfigure PLL to the same values

When we configure the PLL record the input and output frequency, then if we
get asked to configure the same values again just skip reprogramming the
hardware. This makes things a bit easier to use for machine drivers since
it means they don't need to keep track of if they've programmed the PLL
so much.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220603103530.3844527-1-broonie@kernel.org


Signed-off-by: Mark Brown <broonie@kernel.org>