V4L/DVB (13838): atbm8830: use AGC setting from config

Improves ATBM8830 reception by using per card AGC configuration rather
than register default.

Signed-off-by: David T. L. Wong <davidtlwong@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/dvb-usb/cxusb.c b/drivers/media/dvb/dvb-usb/cxusb.c
index 05fb28e9..a7b8405 100644
--- a/drivers/media/dvb/dvb-usb/cxusb.c
+++ b/drivers/media/dvb/dvb-usb/cxusb.c
@@ -1184,6 +1184,9 @@
 	.osc_clk_freq = 30400, /* in kHz */
 	.if_freq = 0, /* zero IF */
 	.zif_swap_iq = 1,
+	.agc_min = 0x2E,
+	.agc_max = 0x90,
+	.agc_hold_loop = 0,
 };
 
 static int cxusb_mygica_d689_frontend_attach(struct dvb_usb_adapter *adap)