ASoC: SOF: imx: Do not initialize the snd_sof_dsp_ops.read64

The read64 operation is not used by IMX along with other IO functions.
No need to set it for the ops.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <bard.liao@intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@gmail.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20210915122116.18317-4-peter.ujfalusi@linux.intel.com


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