ALSA: hda - remove kerneldoc for internal hdac_i915 function

Drop the kerneldoc markup for connectivity_check() as it's an
static helper function. Fixes the following make W=1 warning:

sound/hda/hdac_i915.c:80: warning: Function parameter or member 'i915' not described in 'connectivity_check'
sound/hda/hdac_i915.c:80: warning: Function parameter or member 'hdac' not described in 'connectivity_check'

Fixes: 7b882fe3 ('ALSA: hda - handle multiple i915 device instances')
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200924161027.3402260-1-kai.vehmanen@linux.intel.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/hda/hdac_i915.c

@@ -73,9 +73,7 @@ void snd_hdac_i915_set_bclk(struct hdac_bus *bus)
 }
 EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk);
 
-/**
- * Returns true if the devices can be connected for audio.
- */
+/* returns true if the devices can be connected for audio */
 static bool connectivity_check(struct pci_dev *i915, struct pci_dev *hdac)
 {
 	struct pci_bus *bus_a = i915->bus, *bus_b = hdac->bus;