[media] saa7134: constify nxt200x_config structures

Declare nxt200x_config structures as const as they are only passed as
an argument to the function dvb_attach. dvb_attach calls its first
argument on the rest of its arguments. The first argument of
dvb_attach in the changed cases is nxt200x_attach and the parameter of
this function to which the object references are passed is of type
const. So, nxt200x_config structures having this property can be made
const.

File size before:
   text	   data	    bss	    dec	    hex	filename
  21320	   3776	     16	  25112	   6218	saa7134/saa7134-dvb.o

File size after:
   text	   data	    bss	    dec	    hex	filename
  21384	   3744	     16	  25144	   6238	saa7134/saa7134-dvb.o
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/saa7134/saa7134-dvb.c

@@ -1042,11 +1042,11 @@ static int md8800_set_high_voltage2(struct dvb_frontend *fe, long arg)
  * nxt200x based ATSC cards, helper functions
  */
 
-static struct nxt200x_config avertvhda180 = {
+static const struct nxt200x_config avertvhda180 = {
 	.demod_address    = 0x0a,
 };
 
-static struct nxt200x_config kworldatsc110 = {
+static const struct nxt200x_config kworldatsc110 = {
 	.demod_address    = 0x0a,
 };