ASoC: intel: Drop superfluous snd_pcm_sgbuf_ops_page

snd_pcm_sgbuf_ops_page is no longer needed to be set explicitly to PCM
page ops since the recent change in the PCM core (*).  Leaving it NULL
should work as long as the preallocation has been done properly.

This patch drops the redundant lines.

(*) 7e8edae3: ALSA: pcm: Handle special page mapping in the
                  default mmap handler
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20191108094641.20086-4-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/intel/haswell/sst-haswell-pcm.c

@@ -796,17 +796,6 @@ static snd_pcm_uframes_t hsw_pcm_pointer(struct snd_soc_component *component,
 	return offset;
 }
 
-#ifdef CONFIG_SND_DMA_SGBUF
-static struct page *hsw_pcm_page(struct snd_soc_component *component,
-				 struct snd_pcm_substream *substream,
-				 unsigned long offset)
-{
-	return snd_pcm_sgbuf_ops_page(substream, offset);
-}
-#else
-#define hsw_pcm_page NULL
-#endif /* CONFIG_SND_DMA_SGBUF */
-
 static int hsw_pcm_open(struct snd_soc_component *component,
 			struct snd_pcm_substream *substream)
 {
@@ -1128,7 +1117,6 @@ static const struct snd_soc_component_driver hsw_dai_component = {
 	.hw_free	= hsw_pcm_hw_free,
 	.trigger	= hsw_pcm_trigger,
 	.pointer	= hsw_pcm_pointer,
-	.page		= hsw_pcm_page,
 	.ioctl		= snd_soc_pcm_lib_ioctl,
 	.pcm_construct	= hsw_pcm_new,
 	.controls	= hsw_volume_controls,

sound/soc/intel/skylake/skl-pcm.c

@@ -1235,17 +1235,6 @@ static int skl_platform_soc_mmap(struct snd_soc_component *component,
 	return snd_pcm_lib_default_mmap(substream, area);
 }
 
-#ifdef CONFIG_SND_DMA_SGBUF
-static struct page *skl_platform_soc_page(struct snd_soc_component *component,
-					  struct snd_pcm_substream *substream,
-					  unsigned long offset)
-{
-	return snd_pcm_sgbuf_ops_page(substream, offset);
-}
-#else
-#define skl_platform_soc_page NULL
-#endif /* CONFIG_SND_DMA_SGBUF */
-
 static u64 skl_adjust_codec_delay(struct snd_pcm_substream *substream,
 				u64 nsec)
 {
@@ -1493,7 +1482,6 @@ static const struct snd_soc_component_driver skl_component  = {
 	.pointer	= skl_platform_soc_pointer,
 	.get_time_info	= skl_platform_soc_get_time_info,
 	.mmap		= skl_platform_soc_mmap,
-	.page		= skl_platform_soc_page,
 	.pcm_construct	= skl_platform_soc_new,
 	.pcm_destruct	= skl_platform_soc_free,
 	.module_get_upon_open = 1, /* increment refcount when a pcm is opened */