gpio: zynq: Add dummy gpio routines

GPIO dummy routines are required for fdt build, may be removed
these dependencies once the u-boot fdt is fully optimized.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>

arch/arm/include/asm/arch-zynq/gpio.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2013 Xilinx, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _ZYNQ_GPIO_H
+#define _ZYNQ_GPIO_H
+
+inline int gpio_get_value(unsigned gpio)
+{
+	return 0;
+}
+
+inline int gpio_set_value(unsigned gpio, int val)
+{
+	return 0;
+}
+
+inline int gpio_request(unsigned gpio, const char *label)
+{
+	return 0;
+}
+
+#endif /* _ZYNQ_GPIO_H */