V4L/DVB: Report supported QAM modes on bt8xx

Here a small patch to get a TwinHan VT DST DVB-T card working with
kernels >= 2.6.32. Analogously to
http://linuxtv.org/hg/v4l-dvb/rev/0e735b509163 I had to:

"Fill in the .caps field in struct dst_dvbt_ops (around line 1763) with
all the supported QAM modulation methods to match the capabilities of
the card as implemented in function dst_set_modulation (around line
502). Note that beginning with linux kernel version 2.6.32 the
modulation method is checked (by function dvb_frontend_check_parameters
in file drivers/media/dvb/dvb-core/dvb_frontend.c) and thus tuning fails
if you use a modulation method that is not present in the .caps field."
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/bt8xx/dst.c

@@ -1763,7 +1763,15 @@ static struct dvb_frontend_ops dst_dvbt_ops = {
 		.frequency_min = 137000000,
 		.frequency_max = 858000000,
 		.frequency_stepsize = 166667,
-		.caps = FE_CAN_FEC_AUTO | FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO
+		.caps = FE_CAN_FEC_AUTO			|
+			FE_CAN_QAM_AUTO			|
+			FE_CAN_QAM_16			|
+			FE_CAN_QAM_32			|
+			FE_CAN_QAM_64			|
+			FE_CAN_QAM_128			|
+			FE_CAN_QAM_256			|
+			FE_CAN_TRANSMISSION_MODE_AUTO	|
+			FE_CAN_GUARD_INTERVAL_AUTO
 	},
 
 	.release = dst_release,