V4L/DVB (3278): convert diagnostics over to the new v4l2-common.h macros.

- Convert diagnostics over to the new v4l2-common.h macros.
- deprecated tuner_debug option, the new option is debug.
- renamed cx25840_debug to debug.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>

include/media/v4l2-common.h

@@ -51,6 +51,7 @@
    parameter called 'debug'. */
 #define v4l_dbg(level, client, fmt, arg...)				     \
 	do { 								     \
+		extern int debug;					     \
 		if (debug >= (level))					     \
 			v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \
 	} while (0)