s3adsp1800: Set the MicroBlaze CPU version to 7.10.d

Set the MicroBlaze CPU version to 7.10.d avoiding a runtime
warning due to an unset CPU version.
Reviewed-by: NPeter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>

hw/microblaze/petalogix_s3adsp1800_mmu.c

@@ -66,6 +66,7 @@ petalogix_s3adsp1800_init(MachineState *machine)
     MemoryRegion *sysmem = get_system_memory();
 
     cpu = MICROBLAZE_CPU(object_new(TYPE_MICROBLAZE_CPU));
+    object_property_set_str(OBJECT(cpu), "7.10.d", "version", &error_abort);
     object_property_set_bool(OBJECT(cpu), true, "realized", &error_abort);
 
     /* Attach emulated BRAM through the LMB.  */