[media] radio-si470x: Fix band selection

The mask was wrong resulting in band 0 and 1 always ending up as band 0
in the register.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/radio/si470x/radio-si470x.h

@@ -87,7 +87,7 @@
 
 #define SYSCONFIG2		5	/* System Configuration 2 */
 #define SYSCONFIG2_SEEKTH	0xff00	/* bits 15..08: RSSI Seek Threshold */
-#define SYSCONFIG2_BAND		0x0080	/* bits 07..06: Band Select */
+#define SYSCONFIG2_BAND		0x00c0	/* bits 07..06: Band Select */
 #define SYSCONFIG2_SPACE	0x0030	/* bits 05..04: Channel Spacing */
 #define SYSCONFIG2_VOLUME	0x000f	/* bits 03..00: Volume */