i2c: Cleanup the includes of <linux/i2c.h>

Clean up the includes of <linux/i2c.h>. Only include this header file
when we actually need it.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/include/media/tuner.h b/include/media/tuner.h
index a41ac411..6dcf3c4 100644
--- a/include/media/tuner.h
+++ b/include/media/tuner.h
@@ -23,6 +23,7 @@
 #define _TUNER_H
 
 #include <linux/videodev2.h>
+#include <linux/i2c.h>
 #include <media/tuner-types.h>
 
 extern int tuner_debug;