gpio: Kconfig: Enable Zynq GPIO driver using kconfig

Enable DM GPIO and ZYNQ GPIO using kconfig instead of the board
config file.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index f56a606..4d2cc50 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -136,4 +136,11 @@
 	help
 	  Say yes here to support Marvell MVEBU (Armada XP/38x) GPIOs.
 
+config ZYNQ_GPIO
+	bool "Zynq GPIO driver"
+	depends on DM_GPIO && ARCH_ZYNQ
+	default y
+	help
+	  Supports GPIO access on Zynq SoC.
+
 endmenu