ASoC: fsl-asoc-card: exclude S20_3LE format for WM8960/WM8962 + SAI

S20_3LE format cannot be used with WM8960/WM8962 codecs when paired
with SAI, due to two distinct BCLK generation limitations:

1. Codec Master Mode:
   When WM8960/WM8962 generates BCLK, it cannot produce the exact
   1.92 MHz required for S20_3LE at 48kHz stereo (48000 × 2 × 20).
   The codec uses fixed dividers from SYSCLK (12.288 MHz), and the
   required divider (6.4) is not available. The closest divider is 6,
   producing 2.048 MHz, which causes right channel corruption.

2. SAI Master Mode:
   SAI derive BCLK from MCLK using integer dividers only. S20_3LE
   requires non-integer divider ratios with standard MCLK frequencies.
   For example, 48kHz stereo needs 1.920 MHz BCLK, which requires a
   divider of 6.4 from 12.288 MHz MCLK (not an integer).

Exclude S20_3LE format for WM8960/WM8962 when used with SAI to prevent
these issues. Users should use S16_LE, S24_LE, or S32_LE instead.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://patch.msgid.link/20260429100028.2739711-5-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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