Fix NPE in InlineContentView

* The NPE is due to in the InlineContentView we try to reparent the
  surface view which is no longer attached to the window, this can
  happen if the InlineContentView is attached to window and then
  immediately detached from the window, before the surface package
  is returned from the remote view process.
* Release the surface package immediately in this case, so the
  remote view can be released.

Test: atest android.autofillservice.cts.inline
Bug: 158139090

Change-Id: I9efdf8ba182a1d66334362edcfb6ba58fcdc222a