arm64: zynqmp: Enable mac address randomization for zc1751 dc5

There is no memory which stores mac address that's why generate it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/xilinx_zynqmp_zc1751_xm019_dc5_defconfig b/configs/xilinx_zynqmp_zc1751_xm019_dc5_defconfig
index 31e4244..99ca366 100644
--- a/configs/xilinx_zynqmp_zc1751_xm019_dc5_defconfig
+++ b/configs/xilinx_zynqmp_zc1751_xm019_dc5_defconfig
@@ -35,6 +35,7 @@
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 CONFIG_ENV_IS_IN_FAT=y
+CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_SPL_DM=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
 CONFIG_CLK_ZYNQMP=y