[media] af9013: convert to regmap api

Use regmap for register access. Own low level i2c read and write
routines for regmap is still needed because chip uses single command
byte in addition to typical i2c register access.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/Kconfig

@@ -436,6 +436,7 @@ config DVB_TDA10048
 config DVB_AF9013
 	tristate "Afatech AF9013 demodulator"
 	depends on DVB_CORE && I2C
+	select REGMAP
 	default m if !MEDIA_SUBDRV_AUTOSELECT
 	help
 	  Say Y when you want to support this frontend.

drivers/media/dvb-frontends/af9013_priv.h

@@ -25,6 +25,7 @@
 #include "af9013.h"
 #include <linux/firmware.h>
 #include <linux/math64.h>
+#include <linux/regmap.h>
 
 #define AF9013_FIRMWARE "dvb-fe-af9013.fw"