[media] si4713: cleanup platform data

Remove unreferenced members from the platform
data's structure.

Signed-off-by: Sebastian Reichel <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

include/media/si4713.h

···
  * Platform dependent definition
  */
 struct si4713_platform_data {
-	const char * const *supply_names;
-	unsigned supplies;
-	int gpio_reset; /* < 0 if not used */
 	bool is_platform_device;
 };