ASoC: fsl_sai: Don't disable bitclock for i.MX8MP

On i.MX8MP, the BCE and TERE bit are binding with mclk
enablement, if BCE and TERE are cleared the MCLK also be
disabled on output pin, that cause the external codec (wm8960)
in wrong state.

Codec (wm8960) is using the mclk to generate PLL clock,
if mclk is disabled before disabling PLL, the codec (wm8960)
won't generate bclk and frameclk when sysclk switch to
MCLK source in next test case.

The test case:
$aplay -r44100 test1.wav (PLL source)
$aplay -r48000 test2.wav (MCLK source)
aplay: pcm_write:2127: write error: Input/output error

Fixes: 269f399d

 ("ASoC: fsl_sai: Disable bit clock with transmitter")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1695116533-23287-1-git-send-email-shengjiu.wang@nxp.com


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