ASoC: SOF: cnl: add pointer ops to use DPIB position

Add .pcm_pointer ops for cannonlake to read DPIB/posbuf and get pointer
for ALSA, to align with apollolake.
Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>

Author: keyonjie

sound/soc/sof/intel/cnl.c

@@ -199,6 +199,7 @@ const struct snd_sof_dsp_ops sof_cnl_ops = {
 	.pcm_close=hda_dsp_pcm_close,
 	.pcm_hw_params=hda_dsp_pcm_hw_params,
 	.pcm_trigger=hda_dsp_pcm_trigger,
+	.pcm_pointer=hda_dsp_pcm_pointer,
 
 /* firmware loading */
 	.load_firmware=snd_sof_load_firmware_raw,