[media] stb0899: restore minimal rate to 5Mbauds

According with Manu Abraham, stb0899 seek algorithm is broken
for symbol rates bellow to 5Mbauds. So, revert those patches:

55b3318b [media] stb0899: allow minimum symbol rate of 2000000
2eeed77f [media] stb0899: allow minimum symbol rate of 1000000
Requested-by: Manu Abraham <abraham.manu@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb-frontends/stb0899_drv.c

@@ -1581,7 +1581,7 @@ static struct dvb_frontend_ops stb0899_ops = {
 		.frequency_max 		= 2150000,
 		.frequency_stepsize	= 0,
 		.frequency_tolerance	= 0,
-		.symbol_rate_min 	=  2000000,
+		.symbol_rate_min 	=  5000000,
 		.symbol_rate_max 	= 45000000,
 
 		.caps 			= FE_CAN_INVERSION_AUTO	|