[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/mb86a16.c b/drivers/media/dvb-frontends/mb86a16.c
index 79bc671..9bb122c 100644
--- a/drivers/media/dvb-frontends/mb86a16.c
+++ b/drivers/media/dvb-frontends/mb86a16.c
@@ -1816,7 +1816,7 @@ static enum dvbfe_algo mb86a16_frontend_algo(struct dvb_frontend *fe)
 	return DVBFE_ALGO_CUSTOM;
 }
 
-static struct dvb_frontend_ops mb86a16_ops = {
+static const struct dvb_frontend_ops mb86a16_ops = {
 	.delsys = { SYS_DVBS },
 	.info = {
 		.name			= "Fujitsu MB86A16 DVB-S",