mfd: as3722: Don't export the regmap config

It's not used outside this file so can be static.
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/as3722.c

@@ -314,7 +314,7 @@ static const struct regmap_access_table as3722_volatile_table = {
 	.n_no_ranges = ARRAY_SIZE(as3722_cacheable_ranges),
 };
 
-const struct regmap_config as3722_regmap_config = {
+static const struct regmap_config as3722_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = AS3722_MAX_REGISTER,