arm64: zynqmp: Enable clock command for all boards

clk command provides an option to see actual clock setting.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/xilinx_zynqmp_zc1751_xm018_dc4_defconfig b/configs/xilinx_zynqmp_zc1751_xm018_dc4_defconfig
index 35dce71..18f2eed 100644
--- a/configs/xilinx_zynqmp_zc1751_xm018_dc4_defconfig
+++ b/configs/xilinx_zynqmp_zc1751_xm018_dc4_defconfig
@@ -15,6 +15,7 @@
 CONFIG_SPL_OS_BOOT=y
 CONFIG_SYS_PROMPT="ZynqMP> "
 CONFIG_CMD_MEMTEST=y
+CONFIG_CMD_CLK=y
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y