[media] au0828: add missing tuner Kconfig dependency

The analog part of au0828 is missing the tuner Kconfig dependency.
That makes the device to not work while in analog mode.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/au0828/Kconfig

@@ -20,6 +20,7 @@ config VIDEO_AU0828_V4L2
 	bool "Auvitek AU0828 v4l2 analog video support"
 	depends on VIDEO_AU0828 && VIDEO_V4L2
 	select DVB_AU8522_V4L if MEDIA_SUBDRV_AUTOSELECT
+	select VIDEO_TUNER
 	default y
 	---help---
 	  This is a video4linux driver for Auvitek's USB device.