[media] media/pci/tw686x: convert driver to use the new vb2_queue dev field

Stop using alloc_ctx and just fill in the device pointer.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/tw686x/tw686x.h

@@ -106,7 +106,6 @@ struct tw686x_video_channel {
 
 struct tw686x_dma_ops {
 	int (*setup)(struct tw686x_dev *dev);
-	void (*cleanup)(struct tw686x_dev *dev);
 	int (*alloc)(struct tw686x_video_channel *vc, unsigned int pb);
 	void (*free)(struct tw686x_video_channel *vc, unsigned int pb);
 	void (*buf_refill)(struct tw686x_video_channel *vc, unsigned int pb);
@@ -132,8 +131,6 @@ struct tw686x_dev {
 	struct pci_dev *pci_dev;
 	__u32 __iomem *mmio;
 
-	void *alloc_ctx;
-
 	const struct tw686x_dma_ops *dma_ops;
 	struct tw686x_video_channel *video_channels;
 	struct tw686x_audio_channel *audio_channels;