qdev: add MemoryRegion property

We need to pass a pointer to a MemoryRegion for mmio_interface.
So this just adds that.
Reviewed-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: NKONRAD Frederic <fred.konrad@greensocs.com>
Signed-off-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>

include/hw/qdev-properties.h

@@ -177,6 +177,8 @@ extern PropertyInfo qdev_prop_arraylen;
     DEFINE_PROP_UNSIGNED(_n, _s, _f, 0, qdev_prop_blocksize, uint16_t)
 #define DEFINE_PROP_PCI_HOST_DEVADDR(_n, _s, _f) \
     DEFINE_PROP(_n, _s, _f, qdev_prop_pci_host_devaddr, PCIHostDeviceAddress)
+#define DEFINE_PROP_MEMORY_REGION(_n, _s, _f)             \
+    DEFINE_PROP(_n, _s, _f, qdev_prop_ptr, MemoryRegion *)
 
 #define DEFINE_PROP_END_OF_LIST()               \
     {}