ALSA: hda - Set use_single_rw flag for regmap

HD-audio doesn't support the bulk access.  Currently it works even
without this flag as implicitly assumed, but it's safer to set
explicitly.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/hda/hdac_regmap.c

@@ -328,6 +328,7 @@ static const struct regmap_config hda_regmap_cfg = {
 	.cache_type = REGCACHE_RBTREE,
 	.reg_read = hda_reg_read,
 	.reg_write = hda_reg_write,
+	.use_single_rw = true,
 };
 
 int snd_hdac_regmap_init(struct hdac_device *codec)