regulator: max77693-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/max77693-regulator.o
   text	   data	    bss	    dec	    hex	filename
   2230	    720	      0	   2950	    b86 regulator/max77693-regulator.o

File size after: drivers/regulator/max77693-regulator.o
   text	   data	    bss	    dec	    hex	filename
   2486	    464	      0	   2950	    b86 regulator/max77693-regulator.o

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

drivers/regulator/max77693-regulator.c

@@ -141,7 +141,7 @@ static const unsigned int max77693_safeout_table[] = {
 	3300000,
 };
 
-static struct regulator_ops max77693_safeout_ops = {
+static const struct regulator_ops max77693_safeout_ops = {
 	.list_voltage		= regulator_list_voltage_table,
 	.is_enabled		= regulator_is_enabled_regmap,
 	.enable			= regulator_enable_regmap,