regulator: pcap-regulator: constify regulator_ops structure

Declare regulator_ops structure as const as it is only stored in the ops
field of a regulator_desc structure. This field is of type const, so
regulator_ops structures having this property can be made const too.

File size before: drivers/regulator/pcap-regulator.o
   text	   data	    bss	    dec	    hex	filename
   5503	    564	      0	   6067	   17b3 regulator/pcap-regulator.o

File size after: drivers/regulator/pcap-regulator.o
   text	   data	    bss	    dec	    hex	filename
   5759	    308	      0	   6067	   17b3 regulator/pcap-regulator.o

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/pcap-regulator.c

@@ -210,7 +210,7 @@ static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
 	return (tmp >> vreg->en) & 1;
 }
 
-static struct regulator_ops pcap_regulator_ops = {
+static const struct regulator_ops pcap_regulator_ops = {
 	.list_voltage	= regulator_list_voltage_table,
 	.set_voltage_sel = pcap_regulator_set_voltage_sel,
 	.get_voltage_sel = pcap_regulator_get_voltage_sel,