V4L/DVB (6540): em28xx: fix failing autodetection after the reboot

The attached patch is required so that the autodetecion code also works after
a reboot.

Setting the I2C speed does not seem to be supported for em2800.
Signed-off-by: NSascha Sommer <saschasommer@freenet.de>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/em28xx/em28xx-video.c

@@ -144,7 +144,8 @@ static int em28xx_config(struct em28xx *dev)
 {
 
 	/* Sets I2C speed to 100 KHz */
-	em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
+	if (!dev->is_em2800)
+		em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 
 	/* enable vbi capturing */