[media] dvb: make DVB frontend *_ops instances "const"

These are immutable.  Making them "const" allows the compiler to move
them to the "rodata" section.

Note that cxd2841er_t_c_ops cannot be made "const", because
cxd2841er_attach() modifies it.  Ouch!

[mchehab@s-opensource.com: fix merge conflicts]
Signed-off-by: Max Kellermann <max.kellermann@gmail.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/dvb-usb/af9005-fe.c

@@ -1430,7 +1430,7 @@ static void af9005_fe_release(struct dvb_frontend *fe)
 	kfree(state);
 }
 
-static struct dvb_frontend_ops af9005_fe_ops;
+static const struct dvb_frontend_ops af9005_fe_ops;
 
 struct dvb_frontend *af9005_fe_attach(struct dvb_usb_device *d)
 {
@@ -1455,7 +1455,7 @@ struct dvb_frontend *af9005_fe_attach(struct dvb_usb_device *d)
 	return NULL;
 }
 
-static struct dvb_frontend_ops af9005_fe_ops = {
+static const struct dvb_frontend_ops af9005_fe_ops = {
 	.delsys = { SYS_DVBT },
 	.info = {
 		 .name = "AF9005 USB DVB-T",