au0828: fix Kconfig dependance

Fix this build error:
ERROR: "videobuf_queue_vmalloc_init" [drivers/media/video/au0828/au0828.ko] undefined!
ERROR: "videobuf_vmalloc_free" [drivers/media/video/au0828/au0828.ko] undefined!
ERROR: "videobuf_to_vmalloc" [drivers/media/video/au0828/au0828.ko] undefined!

---

 drivers/media/video/au0828/Kconfig |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

index 05cdf49..0c3a5ba 100644
@@ -4,6 +4,7 @@ config VIDEO_AU0828
 	depends on I2C && INPUT && DVB_CORE && USB && VIDEO_V4L2
 	select I2C_ALGOBIT
 	select VIDEO_TVEEPROM
+	select VIDEOBUF_VMALLOC
 	select DVB_AU8522 if !DVB_FE_CUSTOMISE
 	select MEDIA_TUNER_XC5000 if !MEDIA_TUNER_CUSTOMISE
 	select MEDIA_TUNER_MXL5007T if !MEDIA_TUNER_CUSTOMISE