[media] rtl28xxu: use rtl2832 demod callbacks accessing its resources

Switch demod resource use from exported symbols to callbacks its
provides.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/usb/dvb-usb-v2/rtl28xxu.h

@@ -80,7 +80,10 @@ struct rtl28xxu_priv {
 	#define SLAVE_DEMOD_MN88472        1
 	#define SLAVE_DEMOD_MN88473        2
 	unsigned int slave_demod:2;
-	struct rtl2830_platform_data rtl2830_platform_data;
+	union {
+		struct rtl2830_platform_data rtl2830_platform_data;
+		struct rtl2832_platform_data rtl2832_platform_data;
+	};
 };
 
 enum rtl28xxu_chip_id {