[media] saa7134: fix page size on some archs

On some archs, like tile, the PAGE_SIZE is not 4K. In the case
of tile arch, it can be either 16KB or 64KB.

Due to that, a warning is produced:
	drivers/media/pci/saa7134/saa7134.h:678:43: warning: large integer implicitly truncated to unsigned type [-Woverflow]

This is actually an error, as it will write trach to the DMA size
registers. The logic at saa7134-ts already does the right thing:

	saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
	saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
	/* TSNOPIT=0, TSCOLAP=0 */
	saa_writeb(SAA7134_TS_DMA2,
		((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00));

So, fix the driver to take larger page sizes into account.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/pci/saa7134/saa7134-go7007.c

@@ -289,9 +289,9 @@ static int saa7134_go7007_stream_start(struct go7007 *go)
 
 	/* Set up transfer block size */
 	saa_writeb(SAA7134_TS_PARALLEL_SERIAL, 128 - 1);
-	saa_writeb(SAA7134_TS_DMA0, (PAGE_SIZE >> 7) - 1);
-	saa_writeb(SAA7134_TS_DMA1, 0);
-	saa_writeb(SAA7134_TS_DMA2, 0);
+	saa_writeb(SAA7134_TS_DMA0, ((PAGE_SIZE >> 7) - 1) & 0xff);
+	saa_writeb(SAA7134_TS_DMA1, (PAGE_SIZE >> 15) & 0xff);
+	saa_writeb(SAA7134_TS_DMA2, (PAGE_SIZE >> 31) & 0x3f);
 
 	/* Enable video streaming mode */
 	saa_writeb(SAA7134_GPIO_GPSTATUS2, GPIO_COMMAND_VIDEO);