[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/stb0899_drv.c b/drivers/media/dvb-frontends/stb0899_drv.c
index 8e7cafb8..cc18891 100644
--- a/drivers/media/dvb-frontends/stb0899_drv.c
+++ b/drivers/media/dvb-frontends/stb0899_drv.c
@@ -1573,7 +1573,7 @@ static enum dvbfe_algo stb0899_frontend_algo(struct dvb_frontend *fe)
 	return DVBFE_ALGO_CUSTOM;
 }
 
-static struct dvb_frontend_ops stb0899_ops = {
+static const struct dvb_frontend_ops stb0899_ops = {
 	.delsys = { SYS_DVBS, SYS_DVBS2, SYS_DSS },
 	.info = {
 		.name 			= "STB0899 Multistandard",