w1: w1-gpio: Make GPIO an output for strong pullup

The logic to drive the data line high to implement a strong pullup
assumed that the pin was already an output - setting a value does
not change an input.

See: raspberrypi/firmware#1143

Signed-off-by: Phil Elwell <phil@raspberrypi.org>

drivers/w1/masters/w1-gpio.c

@@ -33,7 +33,7 @@ static u8 w1_gpio_set_pullup(void *data, int delay)
 			 * This will OVERRIDE open drain emulation and force-pull
 			 * the line high for some time.
 			 */
-			gpiod_set_raw_value(pdata->gpiod, 1);
+			gpiod_direction_output_raw(pdata->gpiod, 1);
 			msleep(pdata->pullup_duration);
 			/*
 			 * This will simply set the line as input since we are doing