ASoC: sun8i-codec: Correct the BCLK divisor calculation

Previously, the BCLK divisor calculation assumed zero padding and
exactly two slots. In order to support the TDM slot binding and
20/24-bit word sizes, those assumptions must be removed.

Due to hardware limitations, the BCLK/LRCK ratio is not as simple as
"slot_width * slots". However, the correct value is already calculated
elsewhere in this function, since it must also be programmed into the
hardware. Reuse that value to calculate the correct SYSCLK/BCLK divisor.

Acked-by: Maxime Ripard <[email protected]>
Signed-off-by: Samuel Holland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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