s390x/virtio: old machine leftovers

Remove some now unused #defines.
Reviewed-By: NSascha Silbe <silbe@linux.vnet.ibm.com>
Reviewed-by: NHalil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>

hw/s390x/s390-virtio.c

@@ -54,8 +54,6 @@
 #endif
 
 #define MAX_BLK_DEVS                    10
-#define S390_MACHINE                    "s390-virtio"
-#define TYPE_S390_MACHINE               MACHINE_TYPE_NAME(S390_MACHINE)
 
 #define S390_TOD_CLOCK_VALUE_MISSING    0x00
 #define S390_TOD_CLOCK_VALUE_PRESENT    0x01