regulator: axp20x: fix set_ramp_delay for AXP209/dcdc2

Initial commit of set_ramp_delay feature was missing an assignment which
should have populated slew_rate table for dcdc2 regulator. Add it.

Fixes: d29f54df ("regulator: axp20x: add support for set_ramp_delay for AXP209")
Signed-off-by: Priit Laes <plaes@plaes.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/axp20x-regulator.c

@@ -378,6 +378,7 @@ static int axp20x_set_ramp_delay(struct regulator_dev *rdev, int ramp)
 	switch (axp20x->variant) {
 	case AXP209_ID:
 		if (desc->id == AXP20X_DCDC2) {
+			slew_rates = axp209_dcdc2_ldo3_slew_rates;
 			rate_count = ARRAY_SIZE(axp209_dcdc2_ldo3_slew_rates);
 			reg = AXP20X_DCDC2_LDO3_V_RAMP;
 			mask = AXP20X_DCDC2_LDO3_V_RAMP_DCDC2_RATE_MASK |