regulator: Use _cansleep() for WM8994 regulator GPIOs

The WM8994 regulator driver is perfectly happy if the GPIO used to enable
the regulator sleeps so call the appropriate GPIO API.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/wm8994-regulator.c

@@ -43,7 +43,7 @@ static int wm8994_ldo_enable(struct regulator_dev *rdev)
 	if (!ldo->enable)
 		return 0;
 
-	gpio_set_value(ldo->enable, 1);
+	gpio_set_value_cansleep(ldo->enable, 1);
 	ldo->is_enabled = true;
 
 	return 0;
@@ -57,7 +57,7 @@ static int wm8994_ldo_disable(struct regulator_dev *rdev)
 	if (!ldo->enable)
 		return -EINVAL;
 
-	gpio_set_value(ldo->enable, 0);
+	gpio_set_value_cansleep(ldo->enable, 0);
 	ldo->is_enabled = false;
 
 	return 0;