ASoC: intel: skylake: Remove superfluous bus ops

The bus_core_ops values set in skl driver are same as the default
values, so we can drop it and pass NULL to snd_hdac_ext_bus_init()
instead.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191212191747.19995-1-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/skl.c

@@ -773,11 +773,6 @@ static void skl_codec_create(struct hdac_bus *bus)
 	}
 }
 
-static const struct hdac_bus_ops bus_core_ops = {
-	.command = snd_hdac_bus_send_cmd,
-	.get_response = snd_hdac_bus_get_response,
-};
-
 static int skl_i915_init(struct hdac_bus *bus)
 {
 	int err;
@@ -888,7 +883,7 @@ static int skl_create(struct pci_dev *pci,
 #if IS_ENABLED(CONFIG_SND_SOC_INTEL_SKYLAKE_HDAUDIO_CODEC)
 	ext_ops = snd_soc_hdac_hda_get_ops();
 #endif
-	snd_hdac_ext_bus_init(bus, &pci->dev, &bus_core_ops, ext_ops);
+	snd_hdac_ext_bus_init(bus, &pci->dev, NULL, ext_ops);
 	bus->use_posbuf = 1;
 	skl->pci = pci;
 	INIT_WORK(&skl->probe_work, skl_probe_work);