media: Fix RTL2832 not depending on REGMAP_I2C

Prevents this compile time error:

ERROR: modpost: "__regmap_init_i2c" [drivers/media/dvb-frontends/rtl2832.ko] undefined!
Signed-off-by: Maxim Plotnikov <wgh@torlan.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/dvb-frontends/Kconfig

@@ -515,7 +515,7 @@ config DVB_RTL2830
 config DVB_RTL2832
 	tristate "Realtek RTL2832 DVB-T"
 	depends on DVB_CORE && I2C && I2C_MUX
-	select REGMAP
+	select REGMAP_I2C
 	default m if !MEDIA_SUBDRV_AUTOSELECT
 	help
 	  Say Y when you want to support this frontend.