[media] tvp5150: add internal signal generator to HW input list

Some tvp5150 variants, have an internal generator that can generate a
black screen output. Since this is a HW block, it should be in the HW
inputs list.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

include/media/i2c/tvp5150.h

@@ -25,6 +25,7 @@
 #define TVP5150_COMPOSITE0 0
 #define TVP5150_COMPOSITE1 1
 #define TVP5150_SVIDEO     2
+#define TVP5150_GENERATOR  3
 
 /* TVP5150 HW outputs */
 #define TVP5150_NORMAL       0