[media] cx231xx: Fix compilation breakage if DVB is not selected

In file included from drivers/media/video/cx231xx/cx231xx-audio.c:40:
drivers/media/video/cx231xx/cx231xx.h:559: error: field ‘frontends’ has incomplete type
make[4]: ** [drivers/media/video/cx231xx/cx231xx-audio.o] Erro 1
make[3]: ** [drivers/media/video/cx231xx] Erro 2
make[2]: ** [drivers/media/video] Erro 2
make[1]: ** [drivers/media] Erro 2
make: ** [drivers] Erro 2

Reported-by: Marcio Araujo Alves <froooozen@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx231xx/cx231xx.h

@@ -35,10 +35,7 @@
 #include <media/videobuf-vmalloc.h>
 #include <media/v4l2-device.h>
 #include <media/ir-core.h>
-#if defined(CONFIG_VIDEO_CX231XX_DVB) || \
-	defined(CONFIG_VIDEO_CX231XX_DVB_MODULE)
 #include <media/videobuf-dvb.h>
-#endif
 
 #include "cx231xx-reg.h"
 #include "cx231xx-pcb-cfg.h"