V4L/DVB (4395): Restore compat_ioctl in pwc driver

The compat_ioctl support of the pwc driver was dropped during the last update of the driver.
I suppose it was by mistake. If yes here is the patch to restore the support.
Signed-off-by: NLuc Van Oostenryck <luc.vanoostenryck@looxix.net>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/pwc/pwc-if.c

@@ -160,6 +160,7 @@ static struct file_operations pwc_fops = {
 	.poll =		pwc_video_poll,
 	.mmap =		pwc_video_mmap,
 	.ioctl =        pwc_video_ioctl,
+	.compat_ioctl = v4l_compat_ioctl32,
 	.llseek =       no_llseek,
 };
 static struct video_device pwc_template = {