zynqmp: Enable SDHCI0 options

Enable SDHCI0 for zynqmp.
Add empty gpio.h because of sdhci requirement.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/include/configs/xilinx_zynqmp.h b/include/configs/xilinx_zynqmp.h
index 45282ed..880d29c 100644
--- a/include/configs/xilinx_zynqmp.h
+++ b/include/configs/xilinx_zynqmp.h
@@ -61,6 +61,8 @@
 #define CONFIG_SYS_BAUDRATE_TABLE \
 	{ 4800, 9600, 19200, 38400, 57600, 115200 }
 
+#define CONFIG_ZYNQ_SDHCI0
+
 /* Command line configuration */
 #define CONFIG_CMD_ENV
 #define CONFIG_CMD_EXT2