[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>
diff --git a/drivers/media/dvb-frontends/ec100.c b/drivers/media/dvb-frontends/ec100.c
index c9012e6..d97ce21 100644
--- a/drivers/media/dvb-frontends/ec100.c
+++ b/drivers/media/dvb-frontends/ec100.c
@@ -280,7 +280,7 @@ static void ec100_release(struct dvb_frontend *fe)
 	kfree(state);
 }
 
-static struct dvb_frontend_ops ec100_ops;
+static const struct dvb_frontend_ops ec100_ops;
 
 struct dvb_frontend *ec100_attach(const struct ec100_config *config,
 	struct i2c_adapter *i2c)
@@ -315,7 +315,7 @@ struct dvb_frontend *ec100_attach(const struct ec100_config *config,
 }
 EXPORT_SYMBOL(ec100_attach);
 
-static struct dvb_frontend_ops ec100_ops = {
+static const struct dvb_frontend_ops ec100_ops = {
 	.delsys = { SYS_DVBT },
 	.info = {
 		.name = "E3C EC100 DVB-T",