Revert "gstreamer1.0: disable flaky gstbin:test_watch_for_state_change test"

Revert "gstreamer1.0: disable flaky gstbin:test_watch_for_state_change test"

This reverts commit 220a527d269f146bdabd66040b5bee7de9e3fd3f.

- Drop this patch and use the upstream solution
  https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2643

Signed-off-by: Jose Quaresma <jose.quaresma@foundries.io>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 9660045d07a2b492ac48a1f1b08aa4288b45d64a)
Signed-off-by: Steve Sakoman <steve@sakoman.com>