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>

arch/arm/Kconfig

@@ -579,6 +579,7 @@ config ARCH_ZYNQ
 	select SPL_OF_CONTROL if SPL
 	select DM
 	select DM_ETH
+	select DM_GPIO
 	select SPL_DM if SPL
 	select DM_MMC
 	select DM_SPI