Replace use of qdev_reset_all() with device_cold_reset()

The legacy function qdev_reset_all() performs a recursive reset,
starting from a qdev.  However, it does not permit any of the devices
in the tree to use three-phase reset, because device reset goes
through the device_legacy_reset() function that only calls the single
DeviceClass::reset method.

Switch to using the device_cold_reset() function instead.  This also
performs a recursive reset, where first the children are reset and
then finally the parent, but it uses the new (...in 2020...)
Resettable mechanism, which supports both the old style single-reset
method and also the new 3-phase reset handling.

This commit changes the five remaining uses of this function.

Commit created with:
 sed -i -e 's/qdev_reset_all/device_cold_reset/g' hw/i386/xen/xen_platform.c hw/input/adb.c hw/remote/vfio-user-obj.c hw/s390x/s390-virtio-ccw.c hw/usb/dev-uas.c

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/remote/vfio-user-obj.c

@@ -678,7 +678,7 @@ static int vfu_object_device_reset(vfu_ctx_t *vfu_ctx, vfu_reset_type_t type)
         return 0;
     }
 
-    qdev_reset_all(DEVICE(o->pci_dev));
+    device_cold_reset(DEVICE(o->pci_dev));
 
     return 0;
 }