gpio: zynq: fix issue in set gpio output direction

This patch fixes zynq_gpio_direction() to call driver specific
zynq_gpio_set_value function rather than top level gpio_set_value.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/gpio/zynq_gpio.c b/drivers/gpio/zynq_gpio.c
index 55a5cba..a760c5b 100644
--- a/drivers/gpio/zynq_gpio.c
+++ b/drivers/gpio/zynq_gpio.c
@@ -292,7 +292,7 @@
 	writel(reg, platdata->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
 
 	/* set the state of the pin */
-	gpio_set_value(gpio, value);
+	zynq_gpio_set_value(dev, gpio, value);
 	return 0;
 }