V4L/DVB (7237): Convert videobuf-dma-sg to generic DMA API

videobuf-dma-sg does not need to depend on PCI. Switch it to using generic
DMA API, convert all affected drivers, relax Kconfig restriction, improve
compile-time type checking, fix some Coding Style violations while at it.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/saa7134/saa7134-empress.c b/drivers/media/video/saa7134/saa7134-empress.c
index 40d4a66..e002be5 100644
--- a/drivers/media/video/saa7134/saa7134-empress.c
+++ b/drivers/media/video/saa7134/saa7134-empress.c
@@ -427,8 +427,8 @@
 	printk(KERN_INFO "%s: registered device video%d [mpeg]\n",
 	       dev->name,dev->empress_dev->minor & 0x1f);
 
-	videobuf_queue_pci_init(&dev->empress_tsq, &saa7134_ts_qops,
-			    dev->pci, &dev->slock,
+	videobuf_queue_sg_init(&dev->empress_tsq, &saa7134_ts_qops,
+			    &dev->pci->dev, &dev->slock,
 			    V4L2_BUF_TYPE_VIDEO_CAPTURE,
 			    V4L2_FIELD_ALTERNATE,
 			    sizeof(struct saa7134_buf),