[media] media: platform: exynos4-is: Constify platform_device_id

The platform_device_id is not modified by the driver and core uses it as
const.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Kamil Debski <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/exynos4-is/media-dev.c

···
 	return 0;
 }
 
-static struct platform_device_id fimc_driver_ids[] __always_unused = {
+static const struct platform_device_id fimc_driver_ids[] __always_unused = {
 	{ .name = "s5p-fimc-md" },
 	{ },
 };