regulator: gpio-regulator: gpio_set_value should use cansleep

If it's possible for gpio_set_value to sleep, we should be using
the *_cansleep call instead. This patch fixes multiple warnings
from gpiolib.

Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 84e585f..9f40b0d 100644
--- a/drivers/regulator/gpio-regulator.c
+++ b/drivers/regulator/gpio-regulator.c
@@ -82,7 +82,7 @@
 
 	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
 		state = (target & (1 << ptr)) >> ptr;
-		gpio_set_value(data->gpios[ptr].gpio, state);
+		gpio_set_value_cansleep(data->gpios[ptr].gpio, state);
 	}
 	data->state = target;
 
@@ -119,7 +119,7 @@
 
 	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
 		state = (target & (1 << ptr)) >> ptr;
-		gpio_set_value(data->gpios[ptr].gpio, state);
+		gpio_set_value_cansleep(data->gpios[ptr].gpio, state);
 	}
 	data->state = target;