xlnx-zcu102: Mark the EP108 machine as deprecated

The EP108 is the same as the ZCU102, mark it as deprecated as we don't
need two machines.
Signed-off-by: NAlistair Francis <alistair.francis@xilinx.com>
Reviewed-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/xlnx-zcu102.c

@@ -180,7 +180,7 @@ static void xlnx_ep108_machine_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
 
-    mc->desc = "Xilinx ZynqMP EP108 board";
+    mc->desc = "Xilinx ZynqMP EP108 board (Deprecated, please use xlnx-zcu102)";
     mc->init = xlnx_ep108_init;
     mc->block_default_type = IF_IDE;
     mc->units_per_default_bus = 1;