[media] e4000: fix compiler warning

drivers/media/tuners/e4000.c:287:3: warning: this decimal constant is unsigned only in ISO C90
   .rangehigh  =  2208000000L,
   ^
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/tuners/e4000.c

@@ -284,7 +284,7 @@ static const struct v4l2_frequency_band bands[] = {
 		.index = 1,
 		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
 		.rangelow   =  1249000000,
-		.rangehigh  =  2208000000L,
+		.rangehigh  =  2208000000UL,
 	},
 };