regulator: bd9571mwv: Statize local symbols

These functions are only used by this driver, make them static.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NMarek Vasut <marek.vasut@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/regulator/bd9571mwv-regulator.c

@@ -43,7 +43,7 @@ enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };
 		.linear_min_sel		= _lmin,		\
 	}
 
-int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
+static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
 {
 	unsigned int val;
 	int ret;
@@ -55,7 +55,7 @@ int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
 	return val & BD9571MWV_AVS_SET_MONI_MASK;
 }
 
-int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
+static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
 						unsigned int sel)
 {
 	int ret;
@@ -68,7 +68,7 @@ int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
 				 rdev->desc->vsel_mask, sel);
 }
 
-int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
+static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
 {
 	unsigned int val;
 	int ret;
@@ -87,7 +87,7 @@ int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
 	return val;
 }
 
-int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
+static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
 						unsigned int sel)
 {
 	return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,