V4L/DVB (6837): Convert cx88_input.audioroute to a bitfield

Prevent us from wasting some extra bytes of memory

Thanks to Trent Piepho, for pointing this out.
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/cx88/cx88.h

@@ -228,7 +228,7 @@ struct cx88_input {
 	enum cx88_itype type;
 	u32             gpio0, gpio1, gpio2, gpio3;
 	unsigned int    vmux:2;
-	unsigned int    audioroute;
+	unsigned int    audioroute:2;
 };
 
 struct cx88_board {