ASoC: Intel: Skylake: Constify struct snd_soc_tplg_ops

Constifying "struct snd_soc_tplg_ops" moves some data to a read-only
section, so increase overall security.

On a x86_64, with allmodconfig:
Before:
   text	   data	    bss	    dec	    hex	filename
  58844	   5282	     56	  64182	   fab6	sound/soc/intel/skylake/skl-topology.o

After:
   text	   data	    bss	    dec	    hex	filename
  59004	   5122	     56	  64182	   fab6	sound/soc/intel/skylake/skl-topology.o
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Link: https://msgid.link/r/48f096b6dc617ecf3ca53211c2a696a4df33b21a.1715526069.git.christophe.jaillet@wanadoo.frSigned-off-by: Mark Brown <broonie@kernel.org>

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

@@ -3470,7 +3470,7 @@ static int skl_tplg_complete(struct snd_soc_component *component)
 	return 0;
 }
 
-static struct snd_soc_tplg_ops skl_tplg_ops  = {
+static const struct snd_soc_tplg_ops skl_tplg_ops = {
 	.widget_load = skl_tplg_widget_load,
 	.control_load = skl_tplg_control_load,
 	.bytes_ext_ops = skl_tlv_ops,