arm64: zynqmp: Enable WDT command

Enable watchdog command to be able to work with watchdogs.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/xilinx_zynqmp_virt_defconfig b/configs/xilinx_zynqmp_virt_defconfig
index dc5778f..d723983 100644
--- a/configs/xilinx_zynqmp_virt_defconfig
+++ b/configs/xilinx_zynqmp_virt_defconfig
@@ -54,6 +54,7 @@
 CONFIG_CMD_SPI=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_USB_MASS_STORAGE=y
+CONFIG_CMD_WDT=y
 CONFIG_CMD_TFTPPUT=y
 CONFIG_CMD_BMP=y
 CONFIG_CMD_CACHE=y