LF-5909-2: ASoC: imx-card: fix DSD mclk frequency

The DSD rate not only DSD64/128/256/512, which are the
multiple rate of 44.1kHz,  but also support the multiple
rate of 48kHz, so can't force all mclk frequency to be
22579200Hz

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Chancel Liu <chancel.liu@nxp.com>