ASoC: fsl_sai: Fix FSL_SAI_xDR/xFR definition

There are multiple xDR and xFR registers, the index is
from 0 to 7. FSL_SAI_xDR and FSL_SAI_xFR is abandoned,
replace them with FSL_SAI_xDR0 and FSL_SAI_xFR0.

Fixes: 4f7a0728 ("ASoC: fsl_sai: Add support for SAI new version")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1653284661-18964-1-git-send-email-shengjiu.wang@nxp.com


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