[media] move dvb-usb-ids.h to dvb-core

While this header were meant to be used just by dvb-usb driver, it
is now being used also by dvb-usb-v2 and cx231xx. So, move it to a
better place.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/dvb-usb-v2/dvb_usb.h b/drivers/media/dvb/dvb-usb-v2/dvb_usb.h
index 4db591b..773817b 100644
--- a/drivers/media/dvb/dvb-usb-v2/dvb_usb.h
+++ b/drivers/media/dvb/dvb-usb-v2/dvb_usb.h
@@ -30,7 +30,7 @@
 #include "dvb_demux.h"
 #include "dvb_net.h"
 #include "dmxdev.h"
-#include "../dvb-usb/dvb-usb-ids.h"
+#include "dvb-usb-ids.h"
 
 /*
  * device file: /dev/dvb/adapter[0-1]/frontend[0-2]