power: pwm_regulator: remove redundant code

The regulator_enable() should be called from upper layer like
regulators_enable_boot_on(), remove it from pwm regulator driver.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
[fixed up typo in commit message:]
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/power/regulator/pwm_regulator.c

@@ -86,12 +86,8 @@ static int pwm_regulator_set_voltage(struct udevice *dev, int uvolt)
 		return ret;
 	}
 
-	ret = pwm_set_enable(priv->pwm, priv->pwm_id, true);
-	if (ret) {
-		dev_err(dev, "Failed to enable PWM\n");
-		return ret;
-	}
 	priv->volt_uV = uvolt;
+
 	return ret;
 }
 
@@ -144,8 +140,6 @@ static int pwm_regulator_probe(struct udevice *dev)
 	if (priv->init_voltage)
 		pwm_regulator_set_voltage(dev, priv->init_voltage);
 
-	pwm_regulator_enable(dev, 1);
-
 	return 0;
 }