ASoC: jz4740-codec: Use regmap

Use regmap-mmio instead of open-coding caching and register accessors.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index b92759a..7015db2 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -229,6 +229,7 @@
 	tristate
 
 config SND_SOC_JZ4740_CODEC
+	select REGMAP_MMIO
 	tristate
 
 config SND_SOC_L3