ALSA: core: Treat snd_device_ops as const

This is a preliminary patch to allow const for snd_device_ops
definitions in each driver's code.  The ops reference is read-only,
hence it can be declared as const for further optimization.

There should be no functional changes by this patch.

Link: https://lore.kernel.org/r/20200103081714.9560-4-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/device.c

@@ -27,7 +27,7 @@
  * Return: Zero if successful, or a negative error code on failure.
  */
 int snd_device_new(struct snd_card *card, enum snd_device_type type,
-		   void *device_data, struct snd_device_ops *ops)
+		   void *device_data, const struct snd_device_ops *ops)
 {
 	struct snd_device *dev;
 	struct list_head *p;