V4L-DVB(7789a): cx18: fix symbol conflict with ivtv driver

LD      drivers/media/video/built-in.o
drivers/media/video/cx18/built-in.o: In function `get_service_set':
/home/v4l/tokernel/git/drivers/media/video/cx18/cx18-ioctl.c:118: multiple definition of `get_service_set'
drivers/media/video/ivtv/built-in.o:/home/v4l/tokernel/git/drivers/media/video/ivtv/ivtv-ioctl.c:119: first defined here
drivers/media/video/cx18/built-in.o: In function `expand_service_set':
/home/v4l/tokernel/git/drivers/media/video/cx18/cx18-ioctl.c:92: multiple definition of `expand_service_set'
drivers/media/video/ivtv/built-in.o:/home/v4l/tokernel/git/drivers/media/video/ivtv/ivtv-ioctl.c:92: first defined here
drivers/media/video/cx18/built-in.o: In function `service2vbi':
/home/v4l/tokernel/git/drivers/media/video/cx18/cx18-ioctl.c:44: multiple definition of `service2vbi'
drivers/media/video/ivtv/built-in.o:/home/v4l/tokernel/git/drivers/media/video/ivtv/ivtv-ioctl.c:42: first defined here
make[2]: ** [drivers/media/video/built-in.o] Erro 1
make[1]: ** [drivers/media/video] Erro 2
make: ** [drivers/media/] Erro 2

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/cx18/cx18-controls.c b/drivers/media/video/cx18/cx18-controls.c
index da299ae..2bdac5e 100644
--- a/drivers/media/video/cx18/cx18-controls.c
+++ b/drivers/media/video/cx18/cx18-controls.c
@@ -184,12 +184,12 @@
 	if (cx->vbi.insert_mpeg == 0)
 		return 0;
 	/* Need sliced data for mpeg insertion */
-	if (get_service_set(cx->vbi.sliced_in) == 0) {
+	if (cx18_get_service_set(cx->vbi.sliced_in) == 0) {
 		if (cx->is_60hz)
 			cx->vbi.sliced_in->service_set = V4L2_SLICED_CAPTION_525;
 		else
 			cx->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
-		expand_service_set(cx->vbi.sliced_in, cx->is_50hz);
+		cx18_expand_service_set(cx->vbi.sliced_in, cx->is_50hz);
 	}
 	return 0;
 }