ASoC: es8328: Use single R/W for regmap

The chip only supports single reads and writes.

Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/codecs/es8328.c b/sound/soc/codecs/es8328.c
index 63e8262..d580300 100644
--- a/sound/soc/codecs/es8328.c
+++ b/sound/soc/codecs/es8328.c
@@ -713,6 +713,7 @@
 	.val_bits	= 8,
 	.max_register	= ES8328_REG_MAX,
 	.cache_type	= REGCACHE_RBTREE,
+	.use_single_rw	= true,
 };
 EXPORT_SYMBOL_GPL(es8328_regmap_config);