[media] ts2020: convert to regmap I2C API

Use regmap to cover I2C register access.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/Kconfig

@@ -239,7 +239,8 @@ config DVB_SI21XX
 
 config DVB_TS2020
 	tristate "Montage Tehnology TS2020 based tuners"
-	depends on DVB_CORE && I2C
+	depends on DVB_CORE
+	select REGMAP_I2C
 	default m if !MEDIA_SUBDRV_AUTOSELECT
 	help
 	  A DVB-S/S2 silicon tuner. Say Y when you want to support this tuner.